--- /dev/null
+<?php
+
+/**
+ * lessphp v0.4.0
+ * http://leafo.net/lessphp
+ *
+ * LESS css compiler, adapted from http://lesscss.org
+ *
+ * For ease of distribution, lessphp 0.4.0 is under a dual license.
+ * You are free to pick which one suits your needs.
+ *
+ * MIT LICENSE
+ *
+ * Copyright (c) 2010-2012 Leaf Corcoran, http://leafo.net/lessphp
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * GPL VERSION 3
+ *
+ * Please refer to http://www.gnu.org/licenses/gpl-3.0.html for the full
+ * text of the GPL version 3
+ */
+
+
+/**
+ * The less compiler and parser.
+ *
+ * Converting LESS to CSS is a three stage process. The incoming file is parsed
+ * by `lessc_parser` into a syntax tree, then it is compiled into another tree
+ * representing the CSS structure by `lessc`. The CSS tree is fed into a
+ * formatter, like `lessc_formatter` which then outputs CSS as a string.
+ *
+ * During the first compile, all values are *reduced*, which means that their
+ * types are brought to the lowest form before being dump as strings. This
+ * handles math equations, variable dereferences, and the like.
+ *
+ * The `parse` function of `lessc` is the entry point.
+ *
+ * In summary:
+ *
+ * The `lessc` class creates an instance of the parser, feeds it LESS code,
+ * then transforms the resulting tree to a CSS tree. This class also holds the
+ * evaluation context, such as all available mixins and variables at any given
+ * time.
+ *
+ * The `lessc_parser` class is only concerned with parsing its input.
+ *
+ * The `lessc_formatter` takes a CSS tree, and dumps it to a formatted string,
+ * handling things like indentation.
+ */
+class lessc {
+ static public $VERSION = "v0.4.0";
+ static protected $TRUE = array("keyword", "true");
+ static protected $FALSE = array("keyword", "false");
+
+ protected $libFunctions = array();
+ protected $registeredVars = array();
+ protected $preserveComments = false;
+
+ public $vPrefix = '@'; // prefix of abstract properties
+ public $mPrefix = '$'; // prefix of abstract blocks
+ public $parentSelector = '&';
+
+ public $importDisabled = false;
+ public $importDir = '';
+
+ protected $numberPrecision = null;
+
+ protected $allParsedFiles = array();
+
+ // set to the parser that generated the current line when compiling
+ // so we know how to create error messages
+ protected $sourceParser = null;
+ protected $sourceLoc = null;
+
+ static public $defaultValue = array("keyword", "");
+
+ static protected $nextImportId = 0; // uniquely identify imports
+
+ // attempts to find the path of an import url, returns null for css files
+ protected function findImport($url) {
+ foreach ((array)$this->importDir as $dir) {
+ $full = $dir.(substr($dir, -1) != '/' ? '/' : '').$url;
+ if ($this->fileExists($file = $full.'.less') || $this->fileExists($file = $full)) {
+ return $file;
+ }
+ }
+
+ return null;
+ }
+
+ protected function fileExists($name) {
+ return is_file($name);
+ }
+
+ static public function compressList($items, $delim) {
+ if (!isset($items[1]) && isset($items[0])) return $items[0];
+ else return array('list', $delim, $items);
+ }
+
+ static public function preg_quote($what) {
+ return preg_quote($what, '/');
+ }
+
+ protected function tryImport($importPath, $parentBlock, $out) {
+ if ($importPath[0] == "function" && $importPath[1] == "url") {
+ $importPath = $this->flattenList($importPath[2]);
+ }
+
+ $str = $this->coerceString($importPath);
+ if ($str === null) return false;
+
+ $url = $this->compileValue($this->lib_e($str));
+
+ // don't import if it ends in css
+ if (substr_compare($url, '.css', -4, 4) === 0) return false;
+
+ $realPath = $this->findImport($url);
+
+ if ($realPath === null) return false;
+
+ if ($this->importDisabled) {
+ return array(false, "/* import disabled */");
+ }
+
+ if (isset($this->allParsedFiles[realpath($realPath)])) {
+ return array(false, null);
+ }
+
+ $this->addParsedFile($realPath);
+ $parser = $this->makeParser($realPath);
+ $root = $parser->parse(file_get_contents($realPath));
+
+ // set the parents of all the block props
+ foreach ($root->props as $prop) {
+ if ($prop[0] == "block") {
+ $prop[1]->parent = $parentBlock;
+ }
+ }
+
+ // copy mixins into scope, set their parents
+ // bring blocks from import into current block
+ // TODO: need to mark the source parser these came from this file
+ foreach ($root->children as $childName => $child) {
+ if (isset($parentBlock->children[$childName])) {
+ $parentBlock->children[$childName] = array_merge(
+ $parentBlock->children[$childName],
+ $child);
+ } else {
+ $parentBlock->children[$childName] = $child;
+ }
+ }
+
+ $pi = pathinfo($realPath);
+ $dir = $pi["dirname"];
+
+ list($top, $bottom) = $this->sortProps($root->props, true);
+ $this->compileImportedProps($top, $parentBlock, $out, $parser, $dir);
+
+ return array(true, $bottom, $parser, $dir);
+ }
+
+ protected function compileImportedProps($props, $block, $out, $sourceParser, $importDir) {
+ $oldSourceParser = $this->sourceParser;
+
+ $oldImport = $this->importDir;
+
+ // TODO: this is because the importDir api is stupid
+ $this->importDir = (array)$this->importDir;
+ array_unshift($this->importDir, $importDir);
+
+ foreach ($props as $prop) {
+ $this->compileProp($prop, $block, $out);
+ }
+
+ $this->importDir = $oldImport;
+ $this->sourceParser = $oldSourceParser;
+ }
+
+ /**
+ * Recursively compiles a block.
+ *
+ * A block is analogous to a CSS block in most cases. A single LESS document
+ * is encapsulated in a block when parsed, but it does not have parent tags
+ * so all of it's children appear on the root level when compiled.
+ *
+ * Blocks are made up of props and children.
+ *
+ * Props are property instructions, array tuples which describe an action
+ * to be taken, eg. write a property, set a variable, mixin a block.
+ *
+ * The children of a block are just all the blocks that are defined within.
+ * This is used to look up mixins when performing a mixin.
+ *
+ * Compiling the block involves pushing a fresh environment on the stack,
+ * and iterating through the props, compiling each one.
+ *
+ * See lessc::compileProp()
+ *
+ */
+ protected function compileBlock($block) {
+ switch ($block->type) {
+ case "root":
+ $this->compileRoot($block);
+ break;
+ case null:
+ $this->compileCSSBlock($block);
+ break;
+ case "media":
+ $this->compileMedia($block);
+ break;
+ case "directive":
+ $name = "@" . $block->name;
+ if (!empty($block->value)) {
+ $name .= " " . $this->compileValue($this->reduce($block->value));
+ }
+
+ $this->compileNestedBlock($block, array($name));
+ break;
+ default:
+ $this->throwError("unknown block type: $block->type\n");
+ }
+ }
+
+ protected function compileCSSBlock($block) {
+ $env = $this->pushEnv();
+
+ $selectors = $this->compileSelectors($block->tags);
+ $env->selectors = $this->multiplySelectors($selectors);
+ $out = $this->makeOutputBlock(null, $env->selectors);
+
+ $this->scope->children[] = $out;
+ $this->compileProps($block, $out);
+
+ $block->scope = $env; // mixins carry scope with them!
+ $this->popEnv();
+ }
+
+ protected function compileMedia($media) {
+ $env = $this->pushEnv($media);
+ $parentScope = $this->mediaParent($this->scope);
+
+ $query = $this->compileMediaQuery($this->multiplyMedia($env));
+
+ $this->scope = $this->makeOutputBlock($media->type, array($query));
+ $parentScope->children[] = $this->scope;
+
+ $this->compileProps($media, $this->scope);
+
+ if (count($this->scope->lines) > 0) {
+ $orphanSelelectors = $this->findClosestSelectors();
+ if (!is_null($orphanSelelectors)) {
+ $orphan = $this->makeOutputBlock(null, $orphanSelelectors);
+ $orphan->lines = $this->scope->lines;
+ array_unshift($this->scope->children, $orphan);
+ $this->scope->lines = array();
+ }
+ }
+
+ $this->scope = $this->scope->parent;
+ $this->popEnv();
+ }
+
+ protected function mediaParent($scope) {
+ while (!empty($scope->parent)) {
+ if (!empty($scope->type) && $scope->type != "media") {
+ break;
+ }
+ $scope = $scope->parent;
+ }
+
+ return $scope;
+ }
+
+ protected function compileNestedBlock($block, $selectors) {
+ $this->pushEnv($block);
+ $this->scope = $this->makeOutputBlock($block->type, $selectors);
+ $this->scope->parent->children[] = $this->scope;
+
+ $this->compileProps($block, $this->scope);
+
+ $this->scope = $this->scope->parent;
+ $this->popEnv();
+ }
+
+ protected function compileRoot($root) {
+ $this->pushEnv();
+ $this->scope = $this->makeOutputBlock($root->type);
+ $this->compileProps($root, $this->scope);
+ $this->popEnv();
+ }
+
+ protected function compileProps($block, $out) {
+ foreach ($this->sortProps($block->props) as $prop) {
+ $this->compileProp($prop, $block, $out);
+ }
+
+ $out->lines = array_values(array_unique($out->lines));
+ }
+
+ protected function sortProps($props, $split = false) {
+ $vars = array();
+ $imports = array();
+ $other = array();
+
+ foreach ($props as $prop) {
+ switch ($prop[0]) {
+ case "assign":
+ if (isset($prop[1][0]) && $prop[1][0] == $this->vPrefix) {
+ $vars[] = $prop;
+ } else {
+ $other[] = $prop;
+ }
+ break;
+ case "import":
+ $id = self::$nextImportId++;
+ $prop[] = $id;
+ $imports[] = $prop;
+ $other[] = array("import_mixin", $id);
+ break;
+ default:
+ $other[] = $prop;
+ }
+ }
+
+ if ($split) {
+ return array(array_merge($vars, $imports), $other);
+ } else {
+ return array_merge($vars, $imports, $other);
+ }
+ }
+
+ protected function compileMediaQuery($queries) {
+ $compiledQueries = array();
+ foreach ($queries as $query) {
+ $parts = array();
+ foreach ($query as $q) {
+ switch ($q[0]) {
+ case "mediaType":
+ $parts[] = implode(" ", array_slice($q, 1));
+ break;
+ case "mediaExp":
+ if (isset($q[2])) {
+ $parts[] = "($q[1]: " .
+ $this->compileValue($this->reduce($q[2])) . ")";
+ } else {
+ $parts[] = "($q[1])";
+ }
+ break;
+ case "variable":
+ $parts[] = $this->compileValue($this->reduce($q));
+ break;
+ }
+ }
+
+ if (count($parts) > 0) {
+ $compiledQueries[] = implode(" and ", $parts);
+ }
+ }
+
+ $out = "@media";
+ if (!empty($parts)) {
+ $out .= " " .
+ implode($this->formatter->selectorSeparator, $compiledQueries);
+ }
+ return $out;
+ }
+
+ protected function multiplyMedia($env, $childQueries = null) {
+ if (is_null($env) ||
+ !empty($env->block->type) && $env->block->type != "media")
+ {
+ return $childQueries;
+ }
+
+ // plain old block, skip
+ if (empty($env->block->type)) {
+ return $this->multiplyMedia($env->parent, $childQueries);
+ }
+
+ $out = array();
+ $queries = $env->block->queries;
+ if (is_null($childQueries)) {
+ $out = $queries;
+ } else {
+ foreach ($queries as $parent) {
+ foreach ($childQueries as $child) {
+ $out[] = array_merge($parent, $child);
+ }
+ }
+ }
+
+ return $this->multiplyMedia($env->parent, $out);
+ }
+
+ protected function expandParentSelectors(&$tag, $replace) {
+ $parts = explode("$&$", $tag);
+ $count = 0;
+ foreach ($parts as &$part) {
+ $part = str_replace($this->parentSelector, $replace, $part, $c);
+ $count += $c;
+ }
+ $tag = implode($this->parentSelector, $parts);
+ return $count;
+ }
+
+ protected function findClosestSelectors() {
+ $env = $this->env;
+ $selectors = null;
+ while ($env !== null) {
+ if (isset($env->selectors)) {
+ $selectors = $env->selectors;
+ break;
+ }
+ $env = $env->parent;
+ }
+
+ return $selectors;
+ }
+
+
+ // multiply $selectors against the nearest selectors in env
+ protected function multiplySelectors($selectors) {
+ // find parent selectors
+
+ $parentSelectors = $this->findClosestSelectors();
+ if (is_null($parentSelectors)) {
+ // kill parent reference in top level selector
+ foreach ($selectors as &$s) {
+ $this->expandParentSelectors($s, "");
+ }
+
+ return $selectors;
+ }
+
+ $out = array();
+ foreach ($parentSelectors as $parent) {
+ foreach ($selectors as $child) {
+ $count = $this->expandParentSelectors($child, $parent);
+
+ // don't prepend the parent tag if & was used
+ if ($count > 0) {
+ $out[] = trim($child);
+ } else {
+ $out[] = trim($parent . ' ' . $child);
+ }
+ }
+ }
+
+ return $out;
+ }
+
+ // reduces selector expressions
+ protected function compileSelectors($selectors) {
+ $out = array();
+
+ foreach ($selectors as $s) {
+ if (is_array($s)) {
+ list(, $value) = $s;
+ $out[] = trim($this->compileValue($this->reduce($value)));
+ } else {
+ $out[] = $s;
+ }
+ }
+
+ return $out;
+ }
+
+ protected function eq($left, $right) {
+ return $left == $right;
+ }
+
+ protected function patternMatch($block, $orderedArgs, $keywordArgs) {
+ // match the guards if it has them
+ // any one of the groups must have all its guards pass for a match
+ if (!empty($block->guards)) {
+ $groupPassed = false;
+ foreach ($block->guards as $guardGroup) {
+ foreach ($guardGroup as $guard) {
+ $this->pushEnv();
+ $this->zipSetArgs($block->args, $orderedArgs, $keywordArgs);
+
+ $negate = false;
+ if ($guard[0] == "negate") {
+ $guard = $guard[1];
+ $negate = true;
+ }
+
+ $passed = $this->reduce($guard) == self::$TRUE;
+ if ($negate) $passed = !$passed;
+
+ $this->popEnv();
+
+ if ($passed) {
+ $groupPassed = true;
+ } else {
+ $groupPassed = false;
+ break;
+ }
+ }
+
+ if ($groupPassed) break;
+ }
+
+ if (!$groupPassed) {
+ return false;
+ }
+ }
+
+ if (empty($block->args)) {
+ return $block->isVararg || empty($orderedArgs) && empty($keywordArgs);
+ }
+
+ $remainingArgs = $block->args;
+ if ($keywordArgs) {
+ $remainingArgs = array();
+ foreach ($block->args as $arg) {
+ if ($arg[0] == "arg" && isset($keywordArgs[$arg[1]])) {
+ continue;
+ }
+
+ $remainingArgs[] = $arg;
+ }
+ }
+
+ $i = -1; // no args
+ // try to match by arity or by argument literal
+ foreach ($remainingArgs as $i => $arg) {
+ switch ($arg[0]) {
+ case "lit":
+ if (empty($orderedArgs[$i]) || !$this->eq($arg[1], $orderedArgs[$i])) {
+ return false;
+ }
+ break;
+ case "arg":
+ // no arg and no default value
+ if (!isset($orderedArgs[$i]) && !isset($arg[2])) {
+ return false;
+ }
+ break;
+ case "rest":
+ $i--; // rest can be empty
+ break 2;
+ }
+ }
+
+ if ($block->isVararg) {
+ return true; // not having enough is handled above
+ } else {
+ $numMatched = $i + 1;
+ // greater than becuase default values always match
+ return $numMatched >= count($orderedArgs);
+ }
+ }
+
+ protected function patternMatchAll($blocks, $orderedArgs, $keywordArgs, $skip=array()) {
+ $matches = null;
+ foreach ($blocks as $block) {
+ // skip seen blocks that don't have arguments
+ if (isset($skip[$block->id]) && !isset($block->args)) {
+ continue;
+ }
+
+ if ($this->patternMatch($block, $orderedArgs, $keywordArgs)) {
+ $matches[] = $block;
+ }
+ }
+
+ return $matches;
+ }
+
+ // attempt to find blocks matched by path and args
+ protected function findBlocks($searchIn, $path, $orderedArgs, $keywordArgs, $seen=array()) {
+ if ($searchIn == null) return null;
+ if (isset($seen[$searchIn->id])) return null;
+ $seen[$searchIn->id] = true;
+
+ $name = $path[0];
+
+ if (isset($searchIn->children[$name])) {
+ $blocks = $searchIn->children[$name];
+ if (count($path) == 1) {
+ $matches = $this->patternMatchAll($blocks, $orderedArgs, $keywordArgs, $seen);
+ if (!empty($matches)) {
+ // This will return all blocks that match in the closest
+ // scope that has any matching block, like lessjs
+ return $matches;
+ }
+ } else {
+ $matches = array();
+ foreach ($blocks as $subBlock) {
+ $subMatches = $this->findBlocks($subBlock,
+ array_slice($path, 1), $orderedArgs, $keywordArgs, $seen);
+
+ if (!is_null($subMatches)) {
+ foreach ($subMatches as $sm) {
+ $matches[] = $sm;
+ }
+ }
+ }
+
+ return count($matches) > 0 ? $matches : null;
+ }
+ }
+ if ($searchIn->parent === $searchIn) return null;
+ return $this->findBlocks($searchIn->parent, $path, $orderedArgs, $keywordArgs, $seen);
+ }
+
+ // sets all argument names in $args to either the default value
+ // or the one passed in through $values
+ protected function zipSetArgs($args, $orderedValues, $keywordValues) {
+ $assignedValues = array();
+
+ $i = 0;
+ foreach ($args as $a) {
+ if ($a[0] == "arg") {
+ if (isset($keywordValues[$a[1]])) {
+ // has keyword arg
+ $value = $keywordValues[$a[1]];
+ } elseif (isset($orderedValues[$i])) {
+ // has ordered arg
+ $value = $orderedValues[$i];
+ $i++;
+ } elseif (isset($a[2])) {
+ // has default value
+ $value = $a[2];
+ } else {
+ $this->throwError("Failed to assign arg " . $a[1]);
+ $value = null; // :(
+ }
+
+ $value = $this->reduce($value);
+ $this->set($a[1], $value);
+ $assignedValues[] = $value;
+ } else {
+ // a lit
+ $i++;
+ }
+ }
+
+ // check for a rest
+ $last = end($args);
+ if ($last[0] == "rest") {
+ $rest = array_slice($orderedValues, count($args) - 1);
+ $this->set($last[1], $this->reduce(array("list", " ", $rest)));
+ }
+
+ // wow is this the only true use of PHP's + operator for arrays?
+ $this->env->arguments = $assignedValues + $orderedValues;
+ }
+
+ // compile a prop and update $lines or $blocks appropriately
+ protected function compileProp($prop, $block, $out) {
+ // set error position context
+ $this->sourceLoc = isset($prop[-1]) ? $prop[-1] : -1;
+
+ switch ($prop[0]) {
+ case 'assign':
+ list(, $name, $value) = $prop;
+ if ($name[0] == $this->vPrefix) {
+ $this->set($name, $value);
+ } else {
+ $out->lines[] = $this->formatter->property($name,
+ $this->compileValue($this->reduce($value)));
+ }
+ break;
+ case 'block':
+ list(, $child) = $prop;
+ $this->compileBlock($child);
+ break;
+ case 'mixin':
+ list(, $path, $args, $suffix) = $prop;
+
+ $orderedArgs = array();
+ $keywordArgs = array();
+ foreach ((array)$args as $arg) {
+ $argval = null;
+ switch ($arg[0]) {
+ case "arg":
+ if (!isset($arg[2])) {
+ $orderedArgs[] = $this->reduce(array("variable", $arg[1]));
+ } else {
+ $keywordArgs[$arg[1]] = $this->reduce($arg[2]);
+ }
+ break;
+
+ case "lit":
+ $orderedArgs[] = $this->reduce($arg[1]);
+ break;
+ default:
+ $this->throwError("Unknown arg type: " . $arg[0]);
+ }
+ }
+
+ $mixins = $this->findBlocks($block, $path, $orderedArgs, $keywordArgs);
+
+ if ($mixins === null) {
+ // fwrite(STDERR,"failed to find block: ".implode(" > ", $path)."\n");
+ break; // throw error here??
+ }
+
+ foreach ($mixins as $mixin) {
+ if ($mixin === $block && !$orderedArgs) {
+ continue;
+ }
+
+ $haveScope = false;
+ if (isset($mixin->parent->scope)) {
+ $haveScope = true;
+ $mixinParentEnv = $this->pushEnv();
+ $mixinParentEnv->storeParent = $mixin->parent->scope;
+ }
+
+ $haveArgs = false;
+ if (isset($mixin->args)) {
+ $haveArgs = true;
+ $this->pushEnv();
+ $this->zipSetArgs($mixin->args, $orderedArgs, $keywordArgs);
+ }
+
+ $oldParent = $mixin->parent;
+ if ($mixin != $block) $mixin->parent = $block;
+
+ foreach ($this->sortProps($mixin->props) as $subProp) {
+ if ($suffix !== null &&
+ $subProp[0] == "assign" &&
+ is_string($subProp[1]) &&
+ $subProp[1]{0} != $this->vPrefix)
+ {
+ $subProp[2] = array(
+ 'list', ' ',
+ array($subProp[2], array('keyword', $suffix))
+ );
+ }
+
+ $this->compileProp($subProp, $mixin, $out);
+ }
+
+ $mixin->parent = $oldParent;
+
+ if ($haveArgs) $this->popEnv();
+ if ($haveScope) $this->popEnv();
+ }
+
+ break;
+ case 'raw':
+ $out->lines[] = $prop[1];
+ break;
+ case "directive":
+ list(, $name, $value) = $prop;
+ $out->lines[] = "@$name " . $this->compileValue($this->reduce($value)).';';
+ break;
+ case "comment":
+ $out->lines[] = $prop[1];
+ break;
+ case "import";
+ list(, $importPath, $importId) = $prop;
+ $importPath = $this->reduce($importPath);
+
+ if (!isset($this->env->imports)) {
+ $this->env->imports = array();
+ }
+
+ $result = $this->tryImport($importPath, $block, $out);
+
+ $this->env->imports[$importId] = $result === false ?
+ array(false, "@import " . $this->compileValue($importPath).";") :
+ $result;
+
+ break;
+ case "import_mixin":
+ list(,$importId) = $prop;
+ $import = $this->env->imports[$importId];
+ if ($import[0] === false) {
+ if (isset($import[1])) {
+ $out->lines[] = $import[1];
+ }
+ } else {
+ list(, $bottom, $parser, $importDir) = $import;
+ $this->compileImportedProps($bottom, $block, $out, $parser, $importDir);
+ }
+
+ break;
+ default:
+ $this->throwError("unknown op: {$prop[0]}\n");
+ }
+ }
+
+
+ /**
+ * Compiles a primitive value into a CSS property value.
+ *
+ * Values in lessphp are typed by being wrapped in arrays, their format is
+ * typically:
+ *
+ * array(type, contents [, additional_contents]*)
+ *
+ * The input is expected to be reduced. This function will not work on
+ * things like expressions and variables.
+ */
+ protected function compileValue($value) {
+ switch ($value[0]) {
+ case 'list':
+ // [1] - delimiter
+ // [2] - array of values
+ return implode($value[1], array_map(array($this, 'compileValue'), $value[2]));
+ case 'raw_color':
+ if (!empty($this->formatter->compressColors)) {
+ return $this->compileValue($this->coerceColor($value));
+ }
+ return $value[1];
+ case 'keyword':
+ // [1] - the keyword
+ return $value[1];
+ case 'number':
+ list(, $num, $unit) = $value;
+ // [1] - the number
+ // [2] - the unit
+ if ($this->numberPrecision !== null) {
+ $num = round($num, $this->numberPrecision);
+ }
+ return $num . $unit;
+ case 'string':
+ // [1] - contents of string (includes quotes)
+ list(, $delim, $content) = $value;
+ foreach ($content as &$part) {
+ if (is_array($part)) {
+ $part = $this->compileValue($part);
+ }
+ }
+ return $delim . implode($content) . $delim;
+ case 'color':
+ // [1] - red component (either number or a %)
+ // [2] - green component
+ // [3] - blue component
+ // [4] - optional alpha component
+ list(, $r, $g, $b) = $value;
+ $r = round($r);
+ $g = round($g);
+ $b = round($b);
+
+ if (count($value) == 5 && $value[4] != 1) { // rgba
+ return 'rgba('.$r.','.$g.','.$b.','.$value[4].')';
+ }
+
+ $h = sprintf("#%02x%02x%02x", $r, $g, $b);
+
+ if (!empty($this->formatter->compressColors)) {
+ // Converting hex color to short notation (e.g. #003399 to #039)
+ if ($h[1] === $h[2] && $h[3] === $h[4] && $h[5] === $h[6]) {
+ $h = '#' . $h[1] . $h[3] . $h[5];
+ }
+ }
+
+ return $h;
+
+ case 'function':
+ list(, $name, $args) = $value;
+ return $name.'('.$this->compileValue($args).')';
+ default: // assumed to be unit
+ $this->throwError("unknown value type: $value[0]");
+ }
+ }
+
+ protected function lib_pow($args) {
+ list($base, $exp) = $this->assertArgs($args, 2, "pow");
+ return pow($this->assertNumber($base), $this->assertNumber($exp));
+ }
+
+ protected function lib_pi() {
+ return pi();
+ }
+
+ protected function lib_mod($args) {
+ list($a, $b) = $this->assertArgs($args, 2, "mod");
+ return $this->assertNumber($a) % $this->assertNumber($b);
+ }
+
+ protected function lib_tan($num) {
+ return tan($this->assertNumber($num));
+ }
+
+ protected function lib_sin($num) {
+ return sin($this->assertNumber($num));
+ }
+
+ protected function lib_cos($num) {
+ return cos($this->assertNumber($num));
+ }
+
+ protected function lib_atan($num) {
+ $num = atan($this->assertNumber($num));
+ return array("number", $num, "rad");
+ }
+
+ protected function lib_asin($num) {
+ $num = asin($this->assertNumber($num));
+ return array("number", $num, "rad");
+ }
+
+ protected function lib_acos($num) {
+ $num = acos($this->assertNumber($num));
+ return array("number", $num, "rad");
+ }
+
+ protected function lib_sqrt($num) {
+ return sqrt($this->assertNumber($num));
+ }
+
+ protected function lib_extract($value) {
+ list($list, $idx) = $this->assertArgs($value, 2, "extract");
+ $idx = $this->assertNumber($idx);
+ // 1 indexed
+ if ($list[0] == "list" && isset($list[2][$idx - 1])) {
+ return $list[2][$idx - 1];
+ }
+ }
+
+ protected function lib_isnumber($value) {
+ return $this->toBool($value[0] == "number");
+ }
+
+ protected function lib_isstring($value) {
+ return $this->toBool($value[0] == "string");
+ }
+
+ protected function lib_iscolor($value) {
+ return $this->toBool($this->coerceColor($value));
+ }
+
+ protected function lib_iskeyword($value) {
+ return $this->toBool($value[0] == "keyword");
+ }
+
+ protected function lib_ispixel($value) {
+ return $this->toBool($value[0] == "number" && $value[2] == "px");
+ }
+
+ protected function lib_ispercentage($value) {
+ return $this->toBool($value[0] == "number" && $value[2] == "%");
+ }
+
+ protected function lib_isem($value) {
+ return $this->toBool($value[0] == "number" && $value[2] == "em");
+ }
+
+ protected function lib_isrem($value) {
+ return $this->toBool($value[0] == "number" && $value[2] == "rem");
+ }
+
+ protected function lib_rgbahex($color) {
+ $color = $this->coerceColor($color);
+ if (is_null($color))
+ $this->throwError("color expected for rgbahex");
+
+ return sprintf("#%02x%02x%02x%02x",
+ isset($color[4]) ? $color[4]*255 : 255,
+ $color[1],$color[2], $color[3]);
+ }
+
+ protected function lib_argb($color){
+ return $this->lib_rgbahex($color);
+ }
+
+ // utility func to unquote a string
+ protected function lib_e($arg) {
+ switch ($arg[0]) {
+ case "list":
+ $items = $arg[2];
+ if (isset($items[0])) {
+ return $this->lib_e($items[0]);
+ }
+ return self::$defaultValue;
+ case "string":
+ $arg[1] = "";
+ return $arg;
+ case "keyword":
+ return $arg;
+ default:
+ return array("keyword", $this->compileValue($arg));
+ }
+ }
+
+ protected function lib__sprintf($args) {
+ if ($args[0] != "list") return $args;
+ $values = $args[2];
+ $string = array_shift($values);
+ $template = $this->compileValue($this->lib_e($string));
+
+ $i = 0;
+ if (preg_match_all('/%[dsa]/', $template, $m)) {
+ foreach ($m[0] as $match) {
+ $val = isset($values[$i]) ?
+ $this->reduce($values[$i]) : array('keyword', '');
+
+ // lessjs compat, renders fully expanded color, not raw color
+ if ($color = $this->coerceColor($val)) {
+ $val = $color;
+ }
+
+ $i++;
+ $rep = $this->compileValue($this->lib_e($val));
+ $template = preg_replace('/'.self::preg_quote($match).'/',
+ $rep, $template, 1);
+ }
+ }
+
+ $d = $string[0] == "string" ? $string[1] : '"';
+ return array("string", $d, array($template));
+ }
+
+ protected function lib_floor($arg) {
+ $value = $this->assertNumber($arg);
+ return array("number", floor($value), $arg[2]);
+ }
+
+ protected function lib_ceil($arg) {
+ $value = $this->assertNumber($arg);
+ return array("number", ceil($value), $arg[2]);
+ }
+
+ protected function lib_round($arg) {
+ $value = $this->assertNumber($arg);
+ return array("number", round($value), $arg[2]);
+ }
+
+ protected function lib_unit($arg) {
+ if ($arg[0] == "list") {
+ list($number, $newUnit) = $arg[2];
+ return array("number", $this->assertNumber($number),
+ $this->compileValue($this->lib_e($newUnit)));
+ } else {
+ return array("number", $this->assertNumber($arg), "");
+ }
+ }
+
+ /**
+ * Helper function to get arguments for color manipulation functions.
+ * takes a list that contains a color like thing and a percentage
+ */
+ protected function colorArgs($args) {
+ if ($args[0] != 'list' || count($args[2]) < 2) {
+ return array(array('color', 0, 0, 0), 0);
+ }
+ list($color, $delta) = $args[2];
+ $color = $this->assertColor($color);
+ $delta = floatval($delta[1]);
+
+ return array($color, $delta);
+ }
+
+ protected function lib_darken($args) {
+ list($color, $delta) = $this->colorArgs($args);
+
+ $hsl = $this->toHSL($color);
+ $hsl[3] = $this->clamp($hsl[3] - $delta, 100);
+ return $this->toRGB($hsl);
+ }
+
+ protected function lib_lighten($args) {
+ list($color, $delta) = $this->colorArgs($args);
+
+ $hsl = $this->toHSL($color);
+ $hsl[3] = $this->clamp($hsl[3] + $delta, 100);
+ return $this->toRGB($hsl);
+ }
+
+ protected function lib_saturate($args) {
+ list($color, $delta) = $this->colorArgs($args);
+
+ $hsl = $this->toHSL($color);
+ $hsl[2] = $this->clamp($hsl[2] + $delta, 100);
+ return $this->toRGB($hsl);
+ }
+
+ protected function lib_desaturate($args) {
+ list($color, $delta) = $this->colorArgs($args);
+
+ $hsl = $this->toHSL($color);
+ $hsl[2] = $this->clamp($hsl[2] - $delta, 100);
+ return $this->toRGB($hsl);
+ }
+
+ protected function lib_spin($args) {
+ list($color, $delta) = $this->colorArgs($args);
+
+ $hsl = $this->toHSL($color);
+
+ $hsl[1] = $hsl[1] + $delta % 360;
+ if ($hsl[1] < 0) $hsl[1] += 360;
+
+ return $this->toRGB($hsl);
+ }
+
+ protected function lib_fadeout($args) {
+ list($color, $delta) = $this->colorArgs($args);
+ $color[4] = $this->clamp((isset($color[4]) ? $color[4] : 1) - $delta/100);
+ return $color;
+ }
+
+ protected function lib_fadein($args) {
+ list($color, $delta) = $this->colorArgs($args);
+ $color[4] = $this->clamp((isset($color[4]) ? $color[4] : 1) + $delta/100);
+ return $color;
+ }
+
+ protected function lib_hue($color) {
+ $hsl = $this->toHSL($this->assertColor($color));
+ return round($hsl[1]);
+ }
+
+ protected function lib_saturation($color) {
+ $hsl = $this->toHSL($this->assertColor($color));
+ return round($hsl[2]);
+ }
+
+ protected function lib_lightness($color) {
+ $hsl = $this->toHSL($this->assertColor($color));
+ return round($hsl[3]);
+ }
+
+ // get the alpha of a color
+ // defaults to 1 for non-colors or colors without an alpha
+ protected function lib_alpha($value) {
+ if (!is_null($color = $this->coerceColor($value))) {
+ return isset($color[4]) ? $color[4] : 1;
+ }
+ }
+
+ // set the alpha of the color
+ protected function lib_fade($args) {
+ list($color, $alpha) = $this->colorArgs($args);
+ $color[4] = $this->clamp($alpha / 100.0);
+ return $color;
+ }
+
+ protected function lib_percentage($arg) {
+ $num = $this->assertNumber($arg);
+ return array("number", $num*100, "%");
+ }
+
+ // mixes two colors by weight
+ // mix(@color1, @color2, [@weight: 50%]);
+ // http://sass-lang.com/docs/yardoc/Sass/Script/Functions.html#mix-instance_method
+ protected function lib_mix($args) {
+ if ($args[0] != "list" || count($args[2]) < 2)
+ $this->throwError("mix expects (color1, color2, weight)");
+
+ list($first, $second) = $args[2];
+ $first = $this->assertColor($first);
+ $second = $this->assertColor($second);
+
+ $first_a = $this->lib_alpha($first);
+ $second_a = $this->lib_alpha($second);
+
+ if (isset($args[2][2])) {
+ $weight = $args[2][2][1] / 100.0;
+ } else {
+ $weight = 0.5;
+ }
+
+ $w = $weight * 2 - 1;
+ $a = $first_a - $second_a;
+
+ $w1 = (($w * $a == -1 ? $w : ($w + $a)/(1 + $w * $a)) + 1) / 2.0;
+ $w2 = 1.0 - $w1;
+
+ $new = array('color',
+ $w1 * $first[1] + $w2 * $second[1],
+ $w1 * $first[2] + $w2 * $second[2],
+ $w1 * $first[3] + $w2 * $second[3],
+ );
+
+ if ($first_a != 1.0 || $second_a != 1.0) {
+ $new[] = $first_a * $weight + $second_a * ($weight - 1);
+ }
+
+ return $this->fixColor($new);
+ }
+
+ protected function lib_contrast($args) {
+ if ($args[0] != 'list' || count($args[2]) < 3) {
+ return array(array('color', 0, 0, 0), 0);
+ }
+
+ list($inputColor, $darkColor, $lightColor) = $args[2];
+
+ $inputColor = $this->assertColor($inputColor);
+ $darkColor = $this->assertColor($darkColor);
+ $lightColor = $this->assertColor($lightColor);
+ $hsl = $this->toHSL($inputColor);
+
+ if ($hsl[3] > 50) {
+ return $darkColor;
+ }
+
+ return $lightColor;
+ }
+
+ protected function assertColor($value, $error = "expected color value") {
+ $color = $this->coerceColor($value);
+ if (is_null($color)) $this->throwError($error);
+ return $color;
+ }
+
+ protected function assertNumber($value, $error = "expecting number") {
+ if ($value[0] == "number") return $value[1];
+ $this->throwError($error);
+ }
+
+ protected function assertArgs($value, $expectedArgs, $name="") {
+ if ($expectedArgs == 1) {
+ return $value;
+ } else {
+ if ($value[0] !== "list" || $value[1] != ",") $this->throwError("expecting list");
+ $values = $value[2];
+ $numValues = count($values);
+ if ($expectedArgs != $numValues) {
+ if ($name) {
+ $name = $name . ": ";
+ }
+
+ $this->throwError("${name}expecting $expectedArgs arguments, got $numValues");
+ }
+
+ return $values;
+ }
+ }
+
+ protected function toHSL($color) {
+ if ($color[0] == 'hsl') return $color;
+
+ $r = $color[1] / 255;
+ $g = $color[2] / 255;
+ $b = $color[3] / 255;
+
+ $min = min($r, $g, $b);
+ $max = max($r, $g, $b);
+
+ $L = ($min + $max) / 2;
+ if ($min == $max) {
+ $S = $H = 0;
+ } else {
+ if ($L < 0.5)
+ $S = ($max - $min)/($max + $min);
+ else
+ $S = ($max - $min)/(2.0 - $max - $min);
+
+ if ($r == $max) $H = ($g - $b)/($max - $min);
+ elseif ($g == $max) $H = 2.0 + ($b - $r)/($max - $min);
+ elseif ($b == $max) $H = 4.0 + ($r - $g)/($max - $min);
+
+ }
+
+ $out = array('hsl',
+ ($H < 0 ? $H + 6 : $H)*60,
+ $S*100,
+ $L*100,
+ );
+
+ if (count($color) > 4) $out[] = $color[4]; // copy alpha
+ return $out;
+ }
+
+ protected function toRGB_helper($comp, $temp1, $temp2) {
+ if ($comp < 0) $comp += 1.0;
+ elseif ($comp > 1) $comp -= 1.0;
+
+ if (6 * $comp < 1) return $temp1 + ($temp2 - $temp1) * 6 * $comp;
+ if (2 * $comp < 1) return $temp2;
+ if (3 * $comp < 2) return $temp1 + ($temp2 - $temp1)*((2/3) - $comp) * 6;
+
+ return $temp1;
+ }
+
+ /**
+ * Converts a hsl array into a color value in rgb.
+ * Expects H to be in range of 0 to 360, S and L in 0 to 100
+ */
+ protected function toRGB($color) {
+ if ($color[0] == 'color') return $color;
+
+ $H = $color[1] / 360;
+ $S = $color[2] / 100;
+ $L = $color[3] / 100;
+
+ if ($S == 0) {
+ $r = $g = $b = $L;
+ } else {
+ $temp2 = $L < 0.5 ?
+ $L*(1.0 + $S) :
+ $L + $S - $L * $S;
+
+ $temp1 = 2.0 * $L - $temp2;
+
+ $r = $this->toRGB_helper($H + 1/3, $temp1, $temp2);
+ $g = $this->toRGB_helper($H, $temp1, $temp2);
+ $b = $this->toRGB_helper($H - 1/3, $temp1, $temp2);
+ }
+
+ // $out = array('color', round($r*255), round($g*255), round($b*255));
+ $out = array('color', $r*255, $g*255, $b*255);
+ if (count($color) > 4) $out[] = $color[4]; // copy alpha
+ return $out;
+ }
+
+ protected function clamp($v, $max = 1, $min = 0) {
+ return min($max, max($min, $v));
+ }
+
+ /**
+ * Convert the rgb, rgba, hsl color literals of function type
+ * as returned by the parser into values of color type.
+ */
+ protected function funcToColor($func) {
+ $fname = $func[1];
+ if ($func[2][0] != 'list') return false; // need a list of arguments
+ $rawComponents = $func[2][2];
+
+ if ($fname == 'hsl' || $fname == 'hsla') {
+ $hsl = array('hsl');
+ $i = 0;
+ foreach ($rawComponents as $c) {
+ $val = $this->reduce($c);
+ $val = isset($val[1]) ? floatval($val[1]) : 0;
+
+ if ($i == 0) $clamp = 360;
+ elseif ($i < 3) $clamp = 100;
+ else $clamp = 1;
+
+ $hsl[] = $this->clamp($val, $clamp);
+ $i++;
+ }
+
+ while (count($hsl) < 4) $hsl[] = 0;
+ return $this->toRGB($hsl);
+
+ } elseif ($fname == 'rgb' || $fname == 'rgba') {
+ $components = array();
+ $i = 1;
+ foreach ($rawComponents as $c) {
+ $c = $this->reduce($c);
+ if ($i < 4) {
+ if ($c[0] == "number" && $c[2] == "%") {
+ $components[] = 255 * ($c[1] / 100);
+ } else {
+ $components[] = floatval($c[1]);
+ }
+ } elseif ($i == 4) {
+ if ($c[0] == "number" && $c[2] == "%") {
+ $components[] = 1.0 * ($c[1] / 100);
+ } else {
+ $components[] = floatval($c[1]);
+ }
+ } else break;
+
+ $i++;
+ }
+ while (count($components) < 3) $components[] = 0;
+ array_unshift($components, 'color');
+ return $this->fixColor($components);
+ }
+
+ return false;
+ }
+
+ protected function reduce($value, $forExpression = false) {
+ switch ($value[0]) {
+ case "interpolate":
+ $reduced = $this->reduce($value[1]);
+ $var = $this->compileValue($reduced);
+ $res = $this->reduce(array("variable", $this->vPrefix . $var));
+
+ if ($res[0] == "raw_color") {
+ $res = $this->coerceColor($res);
+ }
+
+ if (empty($value[2])) $res = $this->lib_e($res);
+
+ return $res;
+ case "variable":
+ $key = $value[1];
+ if (is_array($key)) {
+ $key = $this->reduce($key);
+ $key = $this->vPrefix . $this->compileValue($this->lib_e($key));
+ }
+
+ $seen =& $this->env->seenNames;
+
+ if (!empty($seen[$key])) {
+ $this->throwError("infinite loop detected: $key");
+ }
+
+ $seen[$key] = true;
+ $out = $this->reduce($this->get($key, self::$defaultValue));
+ $seen[$key] = false;
+ return $out;
+ case "list":
+ foreach ($value[2] as &$item) {
+ $item = $this->reduce($item, $forExpression);
+ }
+ return $value;
+ case "expression":
+ return $this->evaluate($value);
+ case "string":
+ foreach ($value[2] as &$part) {
+ if (is_array($part)) {
+ $strip = $part[0] == "variable";
+ $part = $this->reduce($part);
+ if ($strip) $part = $this->lib_e($part);
+ }
+ }
+ return $value;
+ case "escape":
+ list(,$inner) = $value;
+ return $this->lib_e($this->reduce($inner));
+ case "function":
+ $color = $this->funcToColor($value);
+ if ($color) return $color;
+
+ list(, $name, $args) = $value;
+ if ($name == "%") $name = "_sprintf";
+ $f = isset($this->libFunctions[$name]) ?
+ $this->libFunctions[$name] : array($this, 'lib_'.$name);
+
+ if (is_callable($f)) {
+ if ($args[0] == 'list')
+ $args = self::compressList($args[2], $args[1]);
+
+ $ret = call_user_func($f, $this->reduce($args, true), $this);
+
+ if (is_null($ret)) {
+ return array("string", "", array(
+ $name, "(", $args, ")"
+ ));
+ }
+
+ // convert to a typed value if the result is a php primitive
+ if (is_numeric($ret)) $ret = array('number', $ret, "");
+ elseif (!is_array($ret)) $ret = array('keyword', $ret);
+
+ return $ret;
+ }
+
+ // plain function, reduce args
+ $value[2] = $this->reduce($value[2]);
+ return $value;
+ case "unary":
+ list(, $op, $exp) = $value;
+ $exp = $this->reduce($exp);
+
+ if ($exp[0] == "number") {
+ switch ($op) {
+ case "+":
+ return $exp;
+ case "-":
+ $exp[1] *= -1;
+ return $exp;
+ }
+ }
+ return array("string", "", array($op, $exp));
+ }
+
+ if ($forExpression) {
+ switch ($value[0]) {
+ case "keyword":
+ if ($color = $this->coerceColor($value)) {
+ return $color;
+ }
+ break;
+ case "raw_color":
+ return $this->coerceColor($value);
+ }
+ }
+
+ return $value;
+ }
+
+
+ // coerce a value for use in color operation
+ protected function coerceColor($value) {
+ switch($value[0]) {
+ case 'color': return $value;
+ case 'raw_color':
+ $c = array("color", 0, 0, 0);
+ $colorStr = substr($value[1], 1);
+ $num = hexdec($colorStr);
+ $width = strlen($colorStr) == 3 ? 16 : 256;
+
+ for ($i = 3; $i > 0; $i--) { // 3 2 1
+ $t = $num % $width;
+ $num /= $width;
+
+ $c[$i] = $t * (256/$width) + $t * floor(16/$width);
+ }
+
+ return $c;
+ case 'keyword':
+ $name = $value[1];
+ if (isset(self::$cssColors[$name])) {
+ $rgba = explode(',', self::$cssColors[$name]);
+
+ if(isset($rgba[3]))
+ return array('color', $rgba[0], $rgba[1], $rgba[2], $rgba[3]);
+
+ return array('color', $rgba[0], $rgba[1], $rgba[2]);
+ }
+ return null;
+ }
+ }
+
+ // make something string like into a string
+ protected function coerceString($value) {
+ switch ($value[0]) {
+ case "string":
+ return $value;
+ case "keyword":
+ return array("string", "", array($value[1]));
+ }
+ return null;
+ }
+
+ // turn list of length 1 into value type
+ protected function flattenList($value) {
+ if ($value[0] == "list" && count($value[2]) == 1) {
+ return $this->flattenList($value[2][0]);
+ }
+ return $value;
+ }
+
+ protected function toBool($a) {
+ if ($a) return self::$TRUE;
+ else return self::$FALSE;
+ }
+
+ // evaluate an expression
+ protected function evaluate($exp) {
+ list(, $op, $left, $right, $whiteBefore, $whiteAfter) = $exp;
+
+ $left = $this->reduce($left, true);
+ $right = $this->reduce($right, true);
+
+ if ($leftColor = $this->coerceColor($left)) {
+ $left = $leftColor;
+ }
+
+ if ($rightColor = $this->coerceColor($right)) {
+ $right = $rightColor;
+ }
+
+ $ltype = $left[0];
+ $rtype = $right[0];
+
+ // operators that work on all types
+ if ($op == "and") {
+ return $this->toBool($left == self::$TRUE && $right == self::$TRUE);
+ }
+
+ if ($op == "=") {
+ return $this->toBool($this->eq($left, $right) );
+ }
+
+ if ($op == "+" && !is_null($str = $this->stringConcatenate($left, $right))) {
+ return $str;
+ }
+
+ // type based operators
+ $fname = "op_${ltype}_${rtype}";
+ if (is_callable(array($this, $fname))) {
+ $out = $this->$fname($op, $left, $right);
+ if (!is_null($out)) return $out;
+ }
+
+ // make the expression look it did before being parsed
+ $paddedOp = $op;
+ if ($whiteBefore) $paddedOp = " " . $paddedOp;
+ if ($whiteAfter) $paddedOp .= " ";
+
+ return array("string", "", array($left, $paddedOp, $right));
+ }
+
+ protected function stringConcatenate($left, $right) {
+ if ($strLeft = $this->coerceString($left)) {
+ if ($right[0] == "string") {
+ $right[1] = "";
+ }
+ $strLeft[2][] = $right;
+ return $strLeft;
+ }
+
+ if ($strRight = $this->coerceString($right)) {
+ array_unshift($strRight[2], $left);
+ return $strRight;
+ }
+ }
+
+
+ // make sure a color's components don't go out of bounds
+ protected function fixColor($c) {
+ foreach (range(1, 3) as $i) {
+ if ($c[$i] < 0) $c[$i] = 0;
+ if ($c[$i] > 255) $c[$i] = 255;
+ }
+
+ return $c;
+ }
+
+ protected function op_number_color($op, $lft, $rgt) {
+ if ($op == '+' || $op == '*') {
+ return $this->op_color_number($op, $rgt, $lft);
+ }
+ }
+
+ protected function op_color_number($op, $lft, $rgt) {
+ if ($rgt[0] == '%') $rgt[1] /= 100;
+
+ return $this->op_color_color($op, $lft,
+ array_fill(1, count($lft) - 1, $rgt[1]));
+ }
+
+ protected function op_color_color($op, $left, $right) {
+ $out = array('color');
+ $max = count($left) > count($right) ? count($left) : count($right);
+ foreach (range(1, $max - 1) as $i) {
+ $lval = isset($left[$i]) ? $left[$i] : 0;
+ $rval = isset($right[$i]) ? $right[$i] : 0;
+ switch ($op) {
+ case '+':
+ $out[] = $lval + $rval;
+ break;
+ case '-':
+ $out[] = $lval - $rval;
+ break;
+ case '*':
+ $out[] = $lval * $rval;
+ break;
+ case '%':
+ $out[] = $lval % $rval;
+ break;
+ case '/':
+ if ($rval == 0) $this->throwError("evaluate error: can't divide by zero");
+ $out[] = $lval / $rval;
+ break;
+ default:
+ $this->throwError('evaluate error: color op number failed on op '.$op);
+ }
+ }
+ return $this->fixColor($out);
+ }
+
+ function lib_red($color){
+ $color = $this->coerceColor($color);
+ if (is_null($color)) {
+ $this->throwError('color expected for red()');
+ }
+
+ return $color[1];
+ }
+
+ function lib_green($color){
+ $color = $this->coerceColor($color);
+ if (is_null($color)) {
+ $this->throwError('color expected for green()');
+ }
+
+ return $color[2];
+ }
+
+ function lib_blue($color){
+ $color = $this->coerceColor($color);
+ if (is_null($color)) {
+ $this->throwError('color expected for blue()');
+ }
+
+ return $color[3];
+ }
+
+
+ // operator on two numbers
+ protected function op_number_number($op, $left, $right) {
+ $unit = empty($left[2]) ? $right[2] : $left[2];
+
+ $value = 0;
+ switch ($op) {
+ case '+':
+ $value = $left[1] + $right[1];
+ break;
+ case '*':
+ $value = $left[1] * $right[1];
+ break;
+ case '-':
+ $value = $left[1] - $right[1];
+ break;
+ case '%':
+ $value = $left[1] % $right[1];
+ break;
+ case '/':
+ if ($right[1] == 0) $this->throwError('parse error: divide by zero');
+ $value = $left[1] / $right[1];
+ break;
+ case '<':
+ return $this->toBool($left[1] < $right[1]);
+ case '>':
+ return $this->toBool($left[1] > $right[1]);
+ case '>=':
+ return $this->toBool($left[1] >= $right[1]);
+ case '=<':
+ return $this->toBool($left[1] <= $right[1]);
+ default:
+ $this->throwError('parse error: unknown number operator: '.$op);
+ }
+
+ return array("number", $value, $unit);
+ }
+
+
+ /* environment functions */
+
+ protected function makeOutputBlock($type, $selectors = null) {
+ $b = new stdclass;
+ $b->lines = array();
+ $b->children = array();
+ $b->selectors = $selectors;
+ $b->type = $type;
+ $b->parent = $this->scope;
+ return $b;
+ }
+
+ // the state of execution
+ protected function pushEnv($block = null) {
+ $e = new stdclass;
+ $e->parent = $this->env;
+ $e->store = array();
+ $e->block = $block;
+
+ $this->env = $e;
+ return $e;
+ }
+
+ // pop something off the stack
+ protected function popEnv() {
+ $old = $this->env;
+ $this->env = $this->env->parent;
+ return $old;
+ }
+
+ // set something in the current env
+ protected function set($name, $value) {
+ $this->env->store[$name] = $value;
+ }
+
+
+ // get the highest occurrence entry for a name
+ protected function get($name, $default=null) {
+ $current = $this->env;
+
+ $isArguments = $name == $this->vPrefix . 'arguments';
+ while ($current) {
+ if ($isArguments && isset($current->arguments)) {
+ return array('list', ' ', $current->arguments);
+ }
+
+ if (isset($current->store[$name]))
+ return $current->store[$name];
+ else {
+ $current = isset($current->storeParent) ?
+ $current->storeParent : $current->parent;
+ }
+ }
+
+ return $default;
+ }
+
+ // inject array of unparsed strings into environment as variables
+ protected function injectVariables($args) {
+ $this->pushEnv();
+ $parser = new lessc_parser($this, __METHOD__);
+ foreach ($args as $name => $strValue) {
+ if ($name{0} != '@') $name = '@'.$name;
+ $parser->count = 0;
+ $parser->buffer = (string)$strValue;
+ if (!$parser->propertyValue($value)) {
+ throw new Exception("failed to parse passed in variable $name: $strValue");
+ }
+
+ $this->set($name, $value);
+ }
+ }
+
+ /**
+ * Initialize any static state, can initialize parser for a file
+ * $opts isn't used yet
+ */
+ public function __construct($fname = null) {
+ if ($fname !== null) {
+ // used for deprecated parse method
+ $this->_parseFile = $fname;
+ }
+ }
+
+ public function compile($string, $name = null) {
+ $locale = setlocale(LC_NUMERIC, 0);
+ setlocale(LC_NUMERIC, "C");
+
+ $this->parser = $this->makeParser($name);
+ $root = $this->parser->parse($string);
+
+ $this->env = null;
+ $this->scope = null;
+
+ $this->formatter = $this->newFormatter();
+
+ if (!empty($this->registeredVars)) {
+ $this->injectVariables($this->registeredVars);
+ }
+
+ $this->sourceParser = $this->parser; // used for error messages
+ $this->compileBlock($root);
+
+ ob_start();
+ $this->formatter->block($this->scope);
+ $out = ob_get_clean();
+ setlocale(LC_NUMERIC, $locale);
+ return $out;
+ }
+
+ public function compileFile($fname, $outFname = null) {
+ if (!is_readable($fname)) {
+ throw new Exception('load error: failed to find '.$fname);
+ }
+
+ $pi = pathinfo($fname);
+
+ $oldImport = $this->importDir;
+
+ $this->importDir = (array)$this->importDir;
+ $this->importDir[] = $pi['dirname'].'/';
+
+ $this->addParsedFile($fname);
+
+ $out = $this->compile(file_get_contents($fname), $fname);
+
+ $this->importDir = $oldImport;
+
+ if ($outFname !== null) {
+ return file_put_contents($outFname, $out);
+ }
+
+ return $out;
+ }
+
+ // compile only if changed input has changed or output doesn't exist
+ public function checkedCompile($in, $out) {
+ if (!is_file($out) || filemtime($in) > filemtime($out)) {
+ $this->compileFile($in, $out);
+ return true;
+ }
+ return false;
+ }
+
+ /**
+ * Execute lessphp on a .less file or a lessphp cache structure
+ *
+ * The lessphp cache structure contains information about a specific
+ * less file having been parsed. It can be used as a hint for future
+ * calls to determine whether or not a rebuild is required.
+ *
+ * The cache structure contains two important keys that may be used
+ * externally:
+ *
+ * compiled: The final compiled CSS
+ * updated: The time (in seconds) the CSS was last compiled
+ *
+ * The cache structure is a plain-ol' PHP associative array and can
+ * be serialized and unserialized without a hitch.
+ *
+ * @param mixed $in Input
+ * @param bool $force Force rebuild?
+ * @return array lessphp cache structure
+ */
+ public function cachedCompile($in, $force = false) {
+ // assume no root
+ $root = null;
+
+ if (is_string($in)) {
+ $root = $in;
+ } elseif (is_array($in) and isset($in['root'])) {
+ if ($force or ! isset($in['files'])) {
+ // If we are forcing a recompile or if for some reason the
+ // structure does not contain any file information we should
+ // specify the root to trigger a rebuild.
+ $root = $in['root'];
+ } elseif (isset($in['files']) and is_array($in['files'])) {
+ foreach ($in['files'] as $fname => $ftime ) {
+ if (!file_exists($fname) or filemtime($fname) > $ftime) {
+ // One of the files we knew about previously has changed
+ // so we should look at our incoming root again.
+ $root = $in['root'];
+ break;
+ }
+ }
+ }
+ } else {
+ // TODO: Throw an exception? We got neither a string nor something
+ // that looks like a compatible lessphp cache structure.
+ return null;
+ }
+
+ if ($root !== null) {
+ // If we have a root value which means we should rebuild.
+ $out = array();
+ $out['root'] = $root;
+ $out['compiled'] = $this->compileFile($root);
+ $out['files'] = $this->allParsedFiles();
+ $out['updated'] = time();
+ return $out;
+ } else {
+ // No changes, pass back the structure
+ // we were given initially.
+ return $in;
+ }
+
+ }
+
+ // parse and compile buffer
+ // This is deprecated
+ public function parse($str = null, $initialVariables = null) {
+ if (is_array($str)) {
+ $initialVariables = $str;
+ $str = null;
+ }
+
+ $oldVars = $this->registeredVars;
+ if ($initialVariables !== null) {
+ $this->setVariables($initialVariables);
+ }
+
+ if ($str == null) {
+ if (empty($this->_parseFile)) {
+ throw new exception("nothing to parse");
+ }
+
+ $out = $this->compileFile($this->_parseFile);
+ } else {
+ $out = $this->compile($str);
+ }
+
+ $this->registeredVars = $oldVars;
+ return $out;
+ }
+
+ protected function makeParser($name) {
+ $parser = new lessc_parser($this, $name);
+ $parser->writeComments = $this->preserveComments;
+
+ return $parser;
+ }
+
+ public function setFormatter($name) {
+ $this->formatterName = $name;
+ }
+
+ protected function newFormatter() {
+ $className = "lessc_formatter_lessjs";
+ if (!empty($this->formatterName)) {
+ if (!is_string($this->formatterName))
+ return $this->formatterName;
+ $className = "lessc_formatter_$this->formatterName";
+ }
+
+ return new $className;
+ }
+
+ public function setPreserveComments($preserve) {
+ $this->preserveComments = $preserve;
+ }
+
+ public function registerFunction($name, $func) {
+ $this->libFunctions[$name] = $func;
+ }
+
+ public function unregisterFunction($name) {
+ unset($this->libFunctions[$name]);
+ }
+
+ public function setVariables($variables) {
+ $this->registeredVars = array_merge($this->registeredVars, $variables);
+ }
+
+ public function unsetVariable($name) {
+ unset($this->registeredVars[$name]);
+ }
+
+ public function setImportDir($dirs) {
+ $this->importDir = (array)$dirs;
+ }
+
+ public function addImportDir($dir) {
+ $this->importDir = (array)$this->importDir;
+ $this->importDir[] = $dir;
+ }
+
+ public function allParsedFiles() {
+ return $this->allParsedFiles;
+ }
+
+ protected function addParsedFile($file) {
+ $this->allParsedFiles[realpath($file)] = filemtime($file);
+ }
+
+ /**
+ * Uses the current value of $this->count to show line and line number
+ */
+ protected function throwError($msg = null) {
+ if ($this->sourceLoc >= 0) {
+ $this->sourceParser->throwError($msg, $this->sourceLoc);
+ }
+ throw new exception($msg);
+ }
+
+ // compile file $in to file $out if $in is newer than $out
+ // returns true when it compiles, false otherwise
+ public static function ccompile($in, $out, $less = null) {
+ if ($less === null) {
+ $less = new self;
+ }
+ return $less->checkedCompile($in, $out);
+ }
+
+ public static function cexecute($in, $force = false, $less = null) {
+ if ($less === null) {
+ $less = new self;
+ }
+ return $less->cachedCompile($in, $force);
+ }
+
+ static protected $cssColors = array(
+ 'aliceblue' => '240,248,255',
+ 'antiquewhite' => '250,235,215',
+ 'aqua' => '0,255,255',
+ 'aquamarine' => '127,255,212',
+ 'azure' => '240,255,255',
+ 'beige' => '245,245,220',
+ 'bisque' => '255,228,196',
+ 'black' => '0,0,0',
+ 'blanchedalmond' => '255,235,205',
+ 'blue' => '0,0,255',
+ 'blueviolet' => '138,43,226',
+ 'brown' => '165,42,42',
+ 'burlywood' => '222,184,135',
+ 'cadetblue' => '95,158,160',
+ 'chartreuse' => '127,255,0',
+ 'chocolate' => '210,105,30',
+ 'coral' => '255,127,80',
+ 'cornflowerblue' => '100,149,237',
+ 'cornsilk' => '255,248,220',
+ 'crimson' => '220,20,60',
+ 'cyan' => '0,255,255',
+ 'darkblue' => '0,0,139',
+ 'darkcyan' => '0,139,139',
+ 'darkgoldenrod' => '184,134,11',
+ 'darkgray' => '169,169,169',
+ 'darkgreen' => '0,100,0',
+ 'darkgrey' => '169,169,169',
+ 'darkkhaki' => '189,183,107',
+ 'darkmagenta' => '139,0,139',
+ 'darkolivegreen' => '85,107,47',
+ 'darkorange' => '255,140,0',
+ 'darkorchid' => '153,50,204',
+ 'darkred' => '139,0,0',
+ 'darksalmon' => '233,150,122',
+ 'darkseagreen' => '143,188,143',
+ 'darkslateblue' => '72,61,139',
+ 'darkslategray' => '47,79,79',
+ 'darkslategrey' => '47,79,79',
+ 'darkturquoise' => '0,206,209',
+ 'darkviolet' => '148,0,211',
+ 'deeppink' => '255,20,147',
+ 'deepskyblue' => '0,191,255',
+ 'dimgray' => '105,105,105',
+ 'dimgrey' => '105,105,105',
+ 'dodgerblue' => '30,144,255',
+ 'firebrick' => '178,34,34',
+ 'floralwhite' => '255,250,240',
+ 'forestgreen' => '34,139,34',
+ 'fuchsia' => '255,0,255',
+ 'gainsboro' => '220,220,220',
+ 'ghostwhite' => '248,248,255',
+ 'gold' => '255,215,0',
+ 'goldenrod' => '218,165,32',
+ 'gray' => '128,128,128',
+ 'green' => '0,128,0',
+ 'greenyellow' => '173,255,47',
+ 'grey' => '128,128,128',
+ 'honeydew' => '240,255,240',
+ 'hotpink' => '255,105,180',
+ 'indianred' => '205,92,92',
+ 'indigo' => '75,0,130',
+ 'ivory' => '255,255,240',
+ 'khaki' => '240,230,140',
+ 'lavender' => '230,230,250',
+ 'lavenderblush' => '255,240,245',
+ 'lawngreen' => '124,252,0',
+ 'lemonchiffon' => '255,250,205',
+ 'lightblue' => '173,216,230',
+ 'lightcoral' => '240,128,128',
+ 'lightcyan' => '224,255,255',
+ 'lightgoldenrodyellow' => '250,250,210',
+ 'lightgray' => '211,211,211',
+ 'lightgreen' => '144,238,144',
+ 'lightgrey' => '211,211,211',
+ 'lightpink' => '255,182,193',
+ 'lightsalmon' => '255,160,122',
+ 'lightseagreen' => '32,178,170',
+ 'lightskyblue' => '135,206,250',
+ 'lightslategray' => '119,136,153',
+ 'lightslategrey' => '119,136,153',
+ 'lightsteelblue' => '176,196,222',
+ 'lightyellow' => '255,255,224',
+ 'lime' => '0,255,0',
+ 'limegreen' => '50,205,50',
+ 'linen' => '250,240,230',
+ 'magenta' => '255,0,255',
+ 'maroon' => '128,0,0',
+ 'mediumaquamarine' => '102,205,170',
+ 'mediumblue' => '0,0,205',
+ 'mediumorchid' => '186,85,211',
+ 'mediumpurple' => '147,112,219',
+ 'mediumseagreen' => '60,179,113',
+ 'mediumslateblue' => '123,104,238',
+ 'mediumspringgreen' => '0,250,154',
+ 'mediumturquoise' => '72,209,204',
+ 'mediumvioletred' => '199,21,133',
+ 'midnightblue' => '25,25,112',
+ 'mintcream' => '245,255,250',
+ 'mistyrose' => '255,228,225',
+ 'moccasin' => '255,228,181',
+ 'navajowhite' => '255,222,173',
+ 'navy' => '0,0,128',
+ 'oldlace' => '253,245,230',
+ 'olive' => '128,128,0',
+ 'olivedrab' => '107,142,35',
+ 'orange' => '255,165,0',
+ 'orangered' => '255,69,0',
+ 'orchid' => '218,112,214',
+ 'palegoldenrod' => '238,232,170',
+ 'palegreen' => '152,251,152',
+ 'paleturquoise' => '175,238,238',
+ 'palevioletred' => '219,112,147',
+ 'papayawhip' => '255,239,213',
+ 'peachpuff' => '255,218,185',
+ 'peru' => '205,133,63',
+ 'pink' => '255,192,203',
+ 'plum' => '221,160,221',
+ 'powderblue' => '176,224,230',
+ 'purple' => '128,0,128',
+ 'red' => '255,0,0',
+ 'rosybrown' => '188,143,143',
+ 'royalblue' => '65,105,225',
+ 'saddlebrown' => '139,69,19',
+ 'salmon' => '250,128,114',
+ 'sandybrown' => '244,164,96',
+ 'seagreen' => '46,139,87',
+ 'seashell' => '255,245,238',
+ 'sienna' => '160,82,45',
+ 'silver' => '192,192,192',
+ 'skyblue' => '135,206,235',
+ 'slateblue' => '106,90,205',
+ 'slategray' => '112,128,144',
+ 'slategrey' => '112,128,144',
+ 'snow' => '255,250,250',
+ 'springgreen' => '0,255,127',
+ 'steelblue' => '70,130,180',
+ 'tan' => '210,180,140',
+ 'teal' => '0,128,128',
+ 'thistle' => '216,191,216',
+ 'tomato' => '255,99,71',
+ 'transparent' => '0,0,0,0',
+ 'turquoise' => '64,224,208',
+ 'violet' => '238,130,238',
+ 'wheat' => '245,222,179',
+ 'white' => '255,255,255',
+ 'whitesmoke' => '245,245,245',
+ 'yellow' => '255,255,0',
+ 'yellowgreen' => '154,205,50'
+ );
+}
+
+// responsible for taking a string of LESS code and converting it into a
+// syntax tree
+class lessc_parser {
+ static protected $nextBlockId = 0; // used to uniquely identify blocks
+
+ static protected $precedence = array(
+ '=<' => 0,
+ '>=' => 0,
+ '=' => 0,
+ '<' => 0,
+ '>' => 0,
+
+ '+' => 1,
+ '-' => 1,
+ '*' => 2,
+ '/' => 2,
+ '%' => 2,
+ );
+
+ static protected $whitePattern;
+ static protected $commentMulti;
+
+ static protected $commentSingle = "//";
+ static protected $commentMultiLeft = "/*";
+ static protected $commentMultiRight = "*/";
+
+ // regex string to match any of the operators
+ static protected $operatorString;
+
+ // these properties will supress division unless it's inside parenthases
+ static protected $supressDivisionProps =
+ array('/border-radius$/i', '/^font$/i');
+
+ protected $blockDirectives = array("font-face", "keyframes", "page", "-moz-document", "viewport", "-moz-viewport", "-o-viewport", "-ms-viewport");
+ protected $lineDirectives = array("charset");
+
+ /**
+ * if we are in parens we can be more liberal with whitespace around
+ * operators because it must evaluate to a single value and thus is less
+ * ambiguous.
+ *
+ * Consider:
+ * property1: 10 -5; // is two numbers, 10 and -5
+ * property2: (10 -5); // should evaluate to 5
+ */
+ protected $inParens = false;
+
+ // caches preg escaped literals
+ static protected $literalCache = array();
+
+ public function __construct($lessc, $sourceName = null) {
+ $this->eatWhiteDefault = true;
+ // reference to less needed for vPrefix, mPrefix, and parentSelector
+ $this->lessc = $lessc;
+
+ $this->sourceName = $sourceName; // name used for error messages
+
+ $this->writeComments = false;
+
+ if (!self::$operatorString) {
+ self::$operatorString =
+ '('.implode('|', array_map(array('lessc', 'preg_quote'),
+ array_keys(self::$precedence))).')';
+
+ $commentSingle = lessc::preg_quote(self::$commentSingle);
+ $commentMultiLeft = lessc::preg_quote(self::$commentMultiLeft);
+ $commentMultiRight = lessc::preg_quote(self::$commentMultiRight);
+
+ self::$commentMulti = $commentMultiLeft.'.*?'.$commentMultiRight;
+ self::$whitePattern = '/'.$commentSingle.'[^\n]*\s*|('.self::$commentMulti.')\s*|\s+/Ais';
+ }
+ }
+
+ public function parse($buffer) {
+ $this->count = 0;
+ $this->line = 1;
+
+ $this->env = null; // block stack
+ $this->buffer = $this->writeComments ? $buffer : $this->removeComments($buffer);
+ $this->pushSpecialBlock("root");
+ $this->eatWhiteDefault = true;
+ $this->seenComments = array();
+
+ // trim whitespace on head
+ // if (preg_match('/^\s+/', $this->buffer, $m)) {
+ // $this->line += substr_count($m[0], "\n");
+ // $this->buffer = ltrim($this->buffer);
+ // }
+ $this->whitespace();
+
+ // parse the entire file
+ $lastCount = $this->count;
+ while (false !== $this->parseChunk());
+
+ if ($this->count != strlen($this->buffer))
+ $this->throwError();
+
+ // TODO report where the block was opened
+ if (!is_null($this->env->parent))
+ throw new exception('parse error: unclosed block');
+
+ return $this->env;
+ }
+
+ /**
+ * Parse a single chunk off the head of the buffer and append it to the
+ * current parse environment.
+ * Returns false when the buffer is empty, or when there is an error.
+ *
+ * This function is called repeatedly until the entire document is
+ * parsed.
+ *
+ * This parser is most similar to a recursive descent parser. Single
+ * functions represent discrete grammatical rules for the language, and
+ * they are able to capture the text that represents those rules.
+ *
+ * Consider the function lessc::keyword(). (all parse functions are
+ * structured the same)
+ *
+ * The function takes a single reference argument. When calling the
+ * function it will attempt to match a keyword on the head of the buffer.
+ * If it is successful, it will place the keyword in the referenced
+ * argument, advance the position in the buffer, and return true. If it
+ * fails then it won't advance the buffer and it will return false.
+ *
+ * All of these parse functions are powered by lessc::match(), which behaves
+ * the same way, but takes a literal regular expression. Sometimes it is
+ * more convenient to use match instead of creating a new function.
+ *
+ * Because of the format of the functions, to parse an entire string of
+ * grammatical rules, you can chain them together using &&.
+ *
+ * But, if some of the rules in the chain succeed before one fails, then
+ * the buffer position will be left at an invalid state. In order to
+ * avoid this, lessc::seek() is used to remember and set buffer positions.
+ *
+ * Before parsing a chain, use $s = $this->seek() to remember the current
+ * position into $s. Then if a chain fails, use $this->seek($s) to
+ * go back where we started.
+ */
+ protected function parseChunk() {
+ if (empty($this->buffer)) return false;
+ $s = $this->seek();
+
+ // setting a property
+ if ($this->keyword($key) && $this->assign() &&
+ $this->propertyValue($value, $key) && $this->end())
+ {
+ $this->append(array('assign', $key, $value), $s);
+ return true;
+ } else {
+ $this->seek($s);
+ }
+
+
+ // look for special css blocks
+ if ($this->literal('@', false)) {
+ $this->count--;
+
+ // media
+ if ($this->literal('@media')) {
+ if (($this->mediaQueryList($mediaQueries) || true)
+ && $this->literal('{'))
+ {
+ $media = $this->pushSpecialBlock("media");
+ $media->queries = is_null($mediaQueries) ? array() : $mediaQueries;
+ return true;
+ } else {
+ $this->seek($s);
+ return false;
+ }
+ }
+
+ if ($this->literal("@", false) && $this->keyword($dirName)) {
+ if ($this->isDirective($dirName, $this->blockDirectives)) {
+ if (($this->openString("{", $dirValue, null, array(";")) || true) &&
+ $this->literal("{"))
+ {
+ $dir = $this->pushSpecialBlock("directive");
+ $dir->name = $dirName;
+ if (isset($dirValue)) $dir->value = $dirValue;
+ return true;
+ }
+ } elseif ($this->isDirective($dirName, $this->lineDirectives)) {
+ if ($this->propertyValue($dirValue) && $this->end()) {
+ $this->append(array("directive", $dirName, $dirValue));
+ return true;
+ }
+ }
+ }
+
+ $this->seek($s);
+ }
+
+ // setting a variable
+ if ($this->variable($var) && $this->assign() &&
+ $this->propertyValue($value) && $this->end())
+ {
+ $this->append(array('assign', $var, $value), $s);
+ return true;
+ } else {
+ $this->seek($s);
+ }
+
+ if ($this->import($importValue)) {
+ $this->append($importValue, $s);
+ return true;
+ }
+
+ // opening parametric mixin
+ if ($this->tag($tag, true) && $this->argumentDef($args, $isVararg) &&
+ ($this->guards($guards) || true) &&
+ $this->literal('{'))
+ {
+ $block = $this->pushBlock($this->fixTags(array($tag)));
+ $block->args = $args;
+ $block->isVararg = $isVararg;
+ if (!empty($guards)) $block->guards = $guards;
+ return true;
+ } else {
+ $this->seek($s);
+ }
+
+ // opening a simple block
+ if ($this->tags($tags) && $this->literal('{')) {
+ $tags = $this->fixTags($tags);
+ $this->pushBlock($tags);
+ return true;
+ } else {
+ $this->seek($s);
+ }
+
+ // closing a block
+ if ($this->literal('}', false)) {
+ try {
+ $block = $this->pop();
+ } catch (exception $e) {
+ $this->seek($s);
+ $this->throwError($e->getMessage());
+ }
+
+ $hidden = false;
+ if (is_null($block->type)) {
+ $hidden = true;
+ if (!isset($block->args)) {
+ foreach ($block->tags as $tag) {
+ if (!is_string($tag) || $tag{0} != $this->lessc->mPrefix) {
+ $hidden = false;
+ break;
+ }
+ }
+ }
+
+ foreach ($block->tags as $tag) {
+ if (is_string($tag)) {
+ $this->env->children[$tag][] = $block;
+ }
+ }
+ }
+
+ if (!$hidden) {
+ $this->append(array('block', $block), $s);
+ }
+
+ // this is done here so comments aren't bundled into he block that
+ // was just closed
+ $this->whitespace();
+ return true;
+ }
+
+ // mixin
+ if ($this->mixinTags($tags) &&
+ ($this->argumentDef($argv, $isVararg) || true) &&
+ ($this->keyword($suffix) || true) && $this->end())
+ {
+ $tags = $this->fixTags($tags);
+ $this->append(array('mixin', $tags, $argv, $suffix), $s);
+ return true;
+ } else {
+ $this->seek($s);
+ }
+
+ // spare ;
+ if ($this->literal(';')) return true;
+
+ return false; // got nothing, throw error
+ }
+
+ protected function isDirective($dirname, $directives) {
+ // TODO: cache pattern in parser
+ $pattern = implode("|",
+ array_map(array("lessc", "preg_quote"), $directives));
+ $pattern = '/^(-[a-z-]+-)?(' . $pattern . ')$/i';
+
+ return preg_match($pattern, $dirname);
+ }
+
+ protected function fixTags($tags) {
+ // move @ tags out of variable namespace
+ foreach ($tags as &$tag) {
+ if ($tag{0} == $this->lessc->vPrefix)
+ $tag[0] = $this->lessc->mPrefix;
+ }
+ return $tags;
+ }
+
+ // a list of expressions
+ protected function expressionList(&$exps) {
+ $values = array();
+
+ while ($this->expression($exp)) {
+ $values[] = $exp;
+ }
+
+ if (count($values) == 0) return false;
+
+ $exps = lessc::compressList($values, ' ');
+ return true;
+ }
+
+ /**
+ * Attempt to consume an expression.
+ * @link http://en.wikipedia.org/wiki/Operator-precedence_parser#Pseudo-code
+ */
+ protected function expression(&$out) {
+ if ($this->value($lhs)) {
+ $out = $this->expHelper($lhs, 0);
+
+ // look for / shorthand
+ if (!empty($this->env->supressedDivision)) {
+ unset($this->env->supressedDivision);
+ $s = $this->seek();
+ if ($this->literal("/") && $this->value($rhs)) {
+ $out = array("list", "",
+ array($out, array("keyword", "/"), $rhs));
+ } else {
+ $this->seek($s);
+ }
+ }
+
+ return true;
+ }
+ return false;
+ }
+
+ /**
+ * recursively parse infix equation with $lhs at precedence $minP
+ */
+ protected function expHelper($lhs, $minP) {
+ $this->inExp = true;
+ $ss = $this->seek();
+
+ while (true) {
+ $whiteBefore = isset($this->buffer[$this->count - 1]) &&
+ ctype_space($this->buffer[$this->count - 1]);
+
+ // If there is whitespace before the operator, then we require
+ // whitespace after the operator for it to be an expression
+ $needWhite = $whiteBefore && !$this->inParens;
+
+ if ($this->match(self::$operatorString.($needWhite ? '\s' : ''), $m) && self::$precedence[$m[1]] >= $minP) {
+ if (!$this->inParens && isset($this->env->currentProperty) && $m[1] == "/" && empty($this->env->supressedDivision)) {
+ foreach (self::$supressDivisionProps as $pattern) {
+ if (preg_match($pattern, $this->env->currentProperty)) {
+ $this->env->supressedDivision = true;
+ break 2;
+ }
+ }
+ }
+
+
+ $whiteAfter = isset($this->buffer[$this->count - 1]) &&
+ ctype_space($this->buffer[$this->count - 1]);
+
+ if (!$this->value($rhs)) break;
+
+ // peek for next operator to see what to do with rhs
+ if ($this->peek(self::$operatorString, $next) && self::$precedence[$next[1]] > self::$precedence[$m[1]]) {
+ $rhs = $this->expHelper($rhs, self::$precedence[$next[1]]);
+ }
+
+ $lhs = array('expression', $m[1], $lhs, $rhs, $whiteBefore, $whiteAfter);
+ $ss = $this->seek();
+
+ continue;
+ }
+
+ break;
+ }
+
+ $this->seek($ss);
+
+ return $lhs;
+ }
+
+ // consume a list of values for a property
+ public function propertyValue(&$value, $keyName = null) {
+ $values = array();
+
+ if ($keyName !== null) $this->env->currentProperty = $keyName;
+
+ $s = null;
+ while ($this->expressionList($v)) {
+ $values[] = $v;
+ $s = $this->seek();
+ if (!$this->literal(',')) break;
+ }
+
+ if ($s) $this->seek($s);
+
+ if ($keyName !== null) unset($this->env->currentProperty);
+
+ if (count($values) == 0) return false;
+
+ $value = lessc::compressList($values, ', ');
+ return true;
+ }
+
+ protected function parenValue(&$out) {
+ $s = $this->seek();
+
+ // speed shortcut
+ if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] != "(") {
+ return false;
+ }
+
+ $inParens = $this->inParens;
+ if ($this->literal("(") &&
+ ($this->inParens = true) && $this->expression($exp) &&
+ $this->literal(")"))
+ {
+ $out = $exp;
+ $this->inParens = $inParens;
+ return true;
+ } else {
+ $this->inParens = $inParens;
+ $this->seek($s);
+ }
+
+ return false;
+ }
+
+ // a single value
+ protected function value(&$value) {
+ $s = $this->seek();
+
+ // speed shortcut
+ if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] == "-") {
+ // negation
+ if ($this->literal("-", false) &&
+ (($this->variable($inner) && $inner = array("variable", $inner)) ||
+ $this->unit($inner) ||
+ $this->parenValue($inner)))
+ {
+ $value = array("unary", "-", $inner);
+ return true;
+ } else {
+ $this->seek($s);
+ }
+ }
+
+ if ($this->parenValue($value)) return true;
+ if ($this->unit($value)) return true;
+ if ($this->color($value)) return true;
+ if ($this->func($value)) return true;
+ if ($this->string($value)) return true;
+
+ if ($this->keyword($word)) {
+ $value = array('keyword', $word);
+ return true;
+ }
+
+ // try a variable
+ if ($this->variable($var)) {
+ $value = array('variable', $var);
+ return true;
+ }
+
+ // unquote string (should this work on any type?
+ if ($this->literal("~") && $this->string($str)) {
+ $value = array("escape", $str);
+ return true;
+ } else {
+ $this->seek($s);
+ }
+
+ // css hack: \0
+ if ($this->literal('\\') && $this->match('([0-9]+)', $m)) {
+ $value = array('keyword', '\\'.$m[1]);
+ return true;
+ } else {
+ $this->seek($s);
+ }
+
+ return false;
+ }
+
+ // an import statement
+ protected function import(&$out) {
+ $s = $this->seek();
+ if (!$this->literal('@import')) return false;
+
+ // @import "something.css" media;
+ // @import url("something.css") media;
+ // @import url(something.css) media;
+
+ if ($this->propertyValue($value)) {
+ $out = array("import", $value);
+ return true;
+ }
+ }
+
+ protected function mediaQueryList(&$out) {
+ if ($this->genericList($list, "mediaQuery", ",", false)) {
+ $out = $list[2];
+ return true;
+ }
+ return false;
+ }
+
+ protected function mediaQuery(&$out) {
+ $s = $this->seek();
+
+ $expressions = null;
+ $parts = array();
+
+ if (($this->literal("only") && ($only = true) || $this->literal("not") && ($not = true) || true) && $this->keyword($mediaType)) {
+ $prop = array("mediaType");
+ if (isset($only)) $prop[] = "only";
+ if (isset($not)) $prop[] = "not";
+ $prop[] = $mediaType;
+ $parts[] = $prop;
+ } else {
+ $this->seek($s);
+ }
+
+
+ if (!empty($mediaType) && !$this->literal("and")) {
+ // ~
+ } else {
+ $this->genericList($expressions, "mediaExpression", "and", false);
+ if (is_array($expressions)) $parts = array_merge($parts, $expressions[2]);
+ }
+
+ if (count($parts) == 0) {
+ $this->seek($s);
+ return false;
+ }
+
+ $out = $parts;
+ return true;
+ }
+
+ protected function mediaExpression(&$out) {
+ $s = $this->seek();
+ $value = null;
+ if ($this->literal("(") &&
+ $this->keyword($feature) &&
+ ($this->literal(":") && $this->expression($value) || true) &&
+ $this->literal(")"))
+ {
+ $out = array("mediaExp", $feature);
+ if ($value) $out[] = $value;
+ return true;
+ } elseif ($this->variable($variable)) {
+ $out = array('variable', $variable);
+ return true;
+ }
+
+ $this->seek($s);
+ return false;
+ }
+
+ // an unbounded string stopped by $end
+ protected function openString($end, &$out, $nestingOpen=null, $rejectStrs = null) {
+ $oldWhite = $this->eatWhiteDefault;
+ $this->eatWhiteDefault = false;
+
+ $stop = array("'", '"', "@{", $end);
+ $stop = array_map(array("lessc", "preg_quote"), $stop);
+ // $stop[] = self::$commentMulti;
+
+ if (!is_null($rejectStrs)) {
+ $stop = array_merge($stop, $rejectStrs);
+ }
+
+ $patt = '(.*?)('.implode("|", $stop).')';
+
+ $nestingLevel = 0;
+
+ $content = array();
+ while ($this->match($patt, $m, false)) {
+ if (!empty($m[1])) {
+ $content[] = $m[1];
+ if ($nestingOpen) {
+ $nestingLevel += substr_count($m[1], $nestingOpen);
+ }
+ }
+
+ $tok = $m[2];
+
+ $this->count-= strlen($tok);
+ if ($tok == $end) {
+ if ($nestingLevel == 0) {
+ break;
+ } else {
+ $nestingLevel--;
+ }
+ }
+
+ if (($tok == "'" || $tok == '"') && $this->string($str)) {
+ $content[] = $str;
+ continue;
+ }
+
+ if ($tok == "@{" && $this->interpolation($inter)) {
+ $content[] = $inter;
+ continue;
+ }
+
+ if (!empty($rejectStrs) && in_array($tok, $rejectStrs)) {
+ break;
+ }
+
+ $content[] = $tok;
+ $this->count+= strlen($tok);
+ }
+
+ $this->eatWhiteDefault = $oldWhite;
+
+ if (count($content) == 0) return false;
+
+ // trim the end
+ if (is_string(end($content))) {
+ $content[count($content) - 1] = rtrim(end($content));
+ }
+
+ $out = array("string", "", $content);
+ return true;
+ }
+
+ protected function string(&$out) {
+ $s = $this->seek();
+ if ($this->literal('"', false)) {
+ $delim = '"';
+ } elseif ($this->literal("'", false)) {
+ $delim = "'";
+ } else {
+ return false;
+ }
+
+ $content = array();
+
+ // look for either ending delim , escape, or string interpolation
+ $patt = '([^\n]*?)(@\{|\\\\|' .
+ lessc::preg_quote($delim).')';
+
+ $oldWhite = $this->eatWhiteDefault;
+ $this->eatWhiteDefault = false;
+
+ while ($this->match($patt, $m, false)) {
+ $content[] = $m[1];
+ if ($m[2] == "@{") {
+ $this->count -= strlen($m[2]);
+ if ($this->interpolation($inter, false)) {
+ $content[] = $inter;
+ } else {
+ $this->count += strlen($m[2]);
+ $content[] = "@{"; // ignore it
+ }
+ } elseif ($m[2] == '\\') {
+ $content[] = $m[2];
+ if ($this->literal($delim, false)) {
+ $content[] = $delim;
+ }
+ } else {
+ $this->count -= strlen($delim);
+ break; // delim
+ }
+ }
+
+ $this->eatWhiteDefault = $oldWhite;
+
+ if ($this->literal($delim)) {
+ $out = array("string", $delim, $content);
+ return true;
+ }
+
+ $this->seek($s);
+ return false;
+ }
+
+ protected function interpolation(&$out) {
+ $oldWhite = $this->eatWhiteDefault;
+ $this->eatWhiteDefault = true;
+
+ $s = $this->seek();
+ if ($this->literal("@{") &&
+ $this->openString("}", $interp, null, array("'", '"', ";")) &&
+ $this->literal("}", false))
+ {
+ $out = array("interpolate", $interp);
+ $this->eatWhiteDefault = $oldWhite;
+ if ($this->eatWhiteDefault) $this->whitespace();
+ return true;
+ }
+
+ $this->eatWhiteDefault = $oldWhite;
+ $this->seek($s);
+ return false;
+ }
+
+ protected function unit(&$unit) {
+ // speed shortcut
+ if (isset($this->buffer[$this->count])) {
+ $char = $this->buffer[$this->count];
+ if (!ctype_digit($char) && $char != ".") return false;
+ }
+
+ if ($this->match('([0-9]+(?:\.[0-9]*)?|\.[0-9]+)([%a-zA-Z]+)?', $m)) {
+ $unit = array("number", $m[1], empty($m[2]) ? "" : $m[2]);
+ return true;
+ }
+ return false;
+ }
+
+ // a # color
+ protected function color(&$out) {
+ if ($this->match('(#(?:[0-9a-f]{8}|[0-9a-f]{6}|[0-9a-f]{3}))', $m)) {
+ if (strlen($m[1]) > 7) {
+ $out = array("string", "", array($m[1]));
+ } else {
+ $out = array("raw_color", $m[1]);
+ }
+ return true;
+ }
+
+ return false;
+ }
+
+ // consume an argument definition list surrounded by ()
+ // each argument is a variable name with optional value
+ // or at the end a ... or a variable named followed by ...
+ // arguments are separated by , unless a ; is in the list, then ; is the
+ // delimiter.
+ protected function argumentDef(&$args, &$isVararg) {
+ $s = $this->seek();
+ if (!$this->literal('(')) return false;
+
+ $values = array();
+ $delim = ",";
+ $method = "expressionList";
+
+ $isVararg = false;
+ while (true) {
+ if ($this->literal("...")) {
+ $isVararg = true;
+ break;
+ }
+
+ if ($this->$method($value)) {
+ if ($value[0] == "variable") {
+ $arg = array("arg", $value[1]);
+ $ss = $this->seek();
+
+ if ($this->assign() && $this->$method($rhs)) {
+ $arg[] = $rhs;
+ } else {
+ $this->seek($ss);
+ if ($this->literal("...")) {
+ $arg[0] = "rest";
+ $isVararg = true;
+ }
+ }
+
+ $values[] = $arg;
+ if ($isVararg) break;
+ continue;
+ } else {
+ $values[] = array("lit", $value);
+ }
+ }
+
+
+ if (!$this->literal($delim)) {
+ if ($delim == "," && $this->literal(";")) {
+ // found new delim, convert existing args
+ $delim = ";";
+ $method = "propertyValue";
+
+ // transform arg list
+ if (isset($values[1])) { // 2 items
+ $newList = array();
+ foreach ($values as $i => $arg) {
+ switch($arg[0]) {
+ case "arg":
+ if ($i) {
+ $this->throwError("Cannot mix ; and , as delimiter types");
+ }
+ $newList[] = $arg[2];
+ break;
+ case "lit":
+ $newList[] = $arg[1];
+ break;
+ case "rest":
+ $this->throwError("Unexpected rest before semicolon");
+ }
+ }
+
+ $newList = array("list", ", ", $newList);
+
+ switch ($values[0][0]) {
+ case "arg":
+ $newArg = array("arg", $values[0][1], $newList);
+ break;
+ case "lit":
+ $newArg = array("lit", $newList);
+ break;
+ }
+
+ } elseif ($values) { // 1 item
+ $newArg = $values[0];
+ }
+
+ if ($newArg) {
+ $values = array($newArg);
+ }
+ } else {
+ break;
+ }
+ }
+ }
+
+ if (!$this->literal(')')) {
+ $this->seek($s);
+ return false;
+ }
+
+ $args = $values;
+
+ return true;
+ }
+
+ // consume a list of tags
+ // this accepts a hanging delimiter
+ protected function tags(&$tags, $simple = false, $delim = ',') {
+ $tags = array();
+ while ($this->tag($tt, $simple)) {
+ $tags[] = $tt;
+ if (!$this->literal($delim)) break;
+ }
+ if (count($tags) == 0) return false;
+
+ return true;
+ }
+
+ // list of tags of specifying mixin path
+ // optionally separated by > (lazy, accepts extra >)
+ protected function mixinTags(&$tags) {
+ $s = $this->seek();
+ $tags = array();
+ while ($this->tag($tt, true)) {
+ $tags[] = $tt;
+ $this->literal(">");
+ }
+
+ if (count($tags) == 0) return false;
+
+ return true;
+ }
+
+ // a bracketed value (contained within in a tag definition)
+ protected function tagBracket(&$parts, &$hasExpression) {
+ // speed shortcut
+ if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] != "[") {
+ return false;
+ }
+
+ $s = $this->seek();
+
+ $hasInterpolation = false;
+
+ if ($this->literal("[", false)) {
+ $attrParts = array("[");
+ // keyword, string, operator
+ while (true) {
+ if ($this->literal("]", false)) {
+ $this->count--;
+ break; // get out early
+ }
+
+ if ($this->match('\s+', $m)) {
+ $attrParts[] = " ";
+ continue;
+ }
+ if ($this->string($str)) {
+ // escape parent selector, (yuck)
+ foreach ($str[2] as &$chunk) {
+ $chunk = str_replace($this->lessc->parentSelector, "$&$", $chunk);
+ }
+
+ $attrParts[] = $str;
+ $hasInterpolation = true;
+ continue;
+ }
+
+ if ($this->keyword($word)) {
+ $attrParts[] = $word;
+ continue;
+ }
+
+ if ($this->interpolation($inter, false)) {
+ $attrParts[] = $inter;
+ $hasInterpolation = true;
+ continue;
+ }
+
+ // operator, handles attr namespace too
+ if ($this->match('[|-~\$\*\^=]+', $m)) {
+ $attrParts[] = $m[0];
+ continue;
+ }
+
+ break;
+ }
+
+ if ($this->literal("]", false)) {
+ $attrParts[] = "]";
+ foreach ($attrParts as $part) {
+ $parts[] = $part;
+ }
+ $hasExpression = $hasExpression || $hasInterpolation;
+ return true;
+ }
+ $this->seek($s);
+ }
+
+ $this->seek($s);
+ return false;
+ }
+
+ // a space separated list of selectors
+ protected function tag(&$tag, $simple = false) {
+ if ($simple)
+ $chars = '^@,:;{}\][>\(\) "\'';
+ else
+ $chars = '^@,;{}["\'';
+
+ $s = $this->seek();
+
+ $hasExpression = false;
+ $parts = array();
+ while ($this->tagBracket($parts, $hasExpression));
+
+ $oldWhite = $this->eatWhiteDefault;
+ $this->eatWhiteDefault = false;
+
+ while (true) {
+ if ($this->match('(['.$chars.'0-9]['.$chars.']*)', $m)) {
+ $parts[] = $m[1];
+ if ($simple) break;
+
+ while ($this->tagBracket($parts, $hasExpression));
+ continue;
+ }
+
+ if (isset($this->buffer[$this->count]) && $this->buffer[$this->count] == "@") {
+ if ($this->interpolation($interp)) {
+ $hasExpression = true;
+ $interp[2] = true; // don't unescape
+ $parts[] = $interp;
+ continue;
+ }
+
+ if ($this->literal("@")) {
+ $parts[] = "@";
+ continue;
+ }
+ }
+
+ if ($this->unit($unit)) { // for keyframes
+ $parts[] = $unit[1];
+ $parts[] = $unit[2];
+ continue;
+ }
+
+ break;
+ }
+
+ $this->eatWhiteDefault = $oldWhite;
+ if (!$parts) {
+ $this->seek($s);
+ return false;
+ }
+
+ if ($hasExpression) {
+ $tag = array("exp", array("string", "", $parts));
+ } else {
+ $tag = trim(implode($parts));
+ }
+
+ $this->whitespace();
+ return true;
+ }
+
+ // a css function
+ protected function func(&$func) {
+ $s = $this->seek();
+
+ if ($this->match('(%|[\w\-_][\w\-_:\.]+|[\w_])', $m) && $this->literal('(')) {
+ $fname = $m[1];
+
+ $sPreArgs = $this->seek();
+
+ $args = array();
+ while (true) {
+ $ss = $this->seek();
+ // this ugly nonsense is for ie filter properties
+ if ($this->keyword($name) && $this->literal('=') && $this->expressionList($value)) {
+ $args[] = array("string", "", array($name, "=", $value));
+ } else {
+ $this->seek($ss);
+ if ($this->expressionList($value)) {
+ $args[] = $value;
+ }
+ }
+
+ if (!$this->literal(',')) break;
+ }
+ $args = array('list', ',', $args);
+
+ if ($this->literal(')')) {
+ $func = array('function', $fname, $args);
+ return true;
+ } elseif ($fname == 'url') {
+ // couldn't parse and in url? treat as string
+ $this->seek($sPreArgs);
+ if ($this->openString(")", $string) && $this->literal(")")) {
+ $func = array('function', $fname, $string);
+ return true;
+ }
+ }
+ }
+
+ $this->seek($s);
+ return false;
+ }
+
+ // consume a less variable
+ protected function variable(&$name) {
+ $s = $this->seek();
+ if ($this->literal($this->lessc->vPrefix, false) &&
+ ($this->variable($sub) || $this->keyword($name)))
+ {
+ if (!empty($sub)) {
+ $name = array('variable', $sub);
+ } else {
+ $name = $this->lessc->vPrefix.$name;
+ }
+ return true;
+ }
+
+ $name = null;
+ $this->seek($s);
+ return false;
+ }
+
+ /**
+ * Consume an assignment operator
+ * Can optionally take a name that will be set to the current property name
+ */
+ protected function assign($name = null) {
+ if ($name) $this->currentProperty = $name;
+ return $this->literal(':') || $this->literal('=');
+ }
+
+ // consume a keyword
+ protected function keyword(&$word) {
+ if ($this->match('([\w_\-\*!"][\w\-_"]*)', $m)) {
+ $word = $m[1];
+ return true;
+ }
+ return false;
+ }
+
+ // consume an end of statement delimiter
+ protected function end() {
+ if ($this->literal(';')) {
+ return true;
+ } elseif ($this->count == strlen($this->buffer) || $this->buffer[$this->count] == '}') {
+ // if there is end of file or a closing block next then we don't need a ;
+ return true;
+ }
+ return false;
+ }
+
+ protected function guards(&$guards) {
+ $s = $this->seek();
+
+ if (!$this->literal("when")) {
+ $this->seek($s);
+ return false;
+ }
+
+ $guards = array();
+
+ while ($this->guardGroup($g)) {
+ $guards[] = $g;
+ if (!$this->literal(",")) break;
+ }
+
+ if (count($guards) == 0) {
+ $guards = null;
+ $this->seek($s);
+ return false;
+ }
+
+ return true;
+ }
+
+ // a bunch of guards that are and'd together
+ // TODO rename to guardGroup
+ protected function guardGroup(&$guardGroup) {
+ $s = $this->seek();
+ $guardGroup = array();
+ while ($this->guard($guard)) {
+ $guardGroup[] = $guard;
+ if (!$this->literal("and")) break;
+ }
+
+ if (count($guardGroup) == 0) {
+ $guardGroup = null;
+ $this->seek($s);
+ return false;
+ }
+
+ return true;
+ }
+
+ protected function guard(&$guard) {
+ $s = $this->seek();
+ $negate = $this->literal("not");
+
+ if ($this->literal("(") && $this->expression($exp) && $this->literal(")")) {
+ $guard = $exp;
+ if ($negate) $guard = array("negate", $guard);
+ return true;
+ }
+
+ $this->seek($s);
+ return false;
+ }
+
+ /* raw parsing functions */
+
+ protected function literal($what, $eatWhitespace = null) {
+ if ($eatWhitespace === null) $eatWhitespace = $this->eatWhiteDefault;
+
+ // shortcut on single letter
+ if (!isset($what[1]) && isset($this->buffer[$this->count])) {
+ if ($this->buffer[$this->count] == $what) {
+ if (!$eatWhitespace) {
+ $this->count++;
+ return true;
+ }
+ // goes below...
+ } else {
+ return false;
+ }
+ }
+
+ if (!isset(self::$literalCache[$what])) {
+ self::$literalCache[$what] = lessc::preg_quote($what);
+ }
+
+ return $this->match(self::$literalCache[$what], $m, $eatWhitespace);
+ }
+
+ protected function genericList(&$out, $parseItem, $delim="", $flatten=true) {
+ $s = $this->seek();
+ $items = array();
+ while ($this->$parseItem($value)) {
+ $items[] = $value;
+ if ($delim) {
+ if (!$this->literal($delim)) break;
+ }
+ }
+
+ if (count($items) == 0) {
+ $this->seek($s);
+ return false;
+ }
+
+ if ($flatten && count($items) == 1) {
+ $out = $items[0];
+ } else {
+ $out = array("list", $delim, $items);
+ }
+
+ return true;
+ }
+
+
+ // advance counter to next occurrence of $what
+ // $until - don't include $what in advance
+ // $allowNewline, if string, will be used as valid char set
+ protected function to($what, &$out, $until = false, $allowNewline = false) {
+ if (is_string($allowNewline)) {
+ $validChars = $allowNewline;
+ } else {
+ $validChars = $allowNewline ? "." : "[^\n]";
+ }
+ if (!$this->match('('.$validChars.'*?)'.lessc::preg_quote($what), $m, !$until)) return false;
+ if ($until) $this->count -= strlen($what); // give back $what
+ $out = $m[1];
+ return true;
+ }
+
+ // try to match something on head of buffer
+ protected function match($regex, &$out, $eatWhitespace = null) {
+ if ($eatWhitespace === null) $eatWhitespace = $this->eatWhiteDefault;
+
+ $r = '/'.$regex.($eatWhitespace && !$this->writeComments ? '\s*' : '').'/Ais';
+ if (preg_match($r, $this->buffer, $out, null, $this->count)) {
+ $this->count += strlen($out[0]);
+ if ($eatWhitespace && $this->writeComments) $this->whitespace();
+ return true;
+ }
+ return false;
+ }
+
+ // match some whitespace
+ protected function whitespace() {
+ if ($this->writeComments) {
+ $gotWhite = false;
+ while (preg_match(self::$whitePattern, $this->buffer, $m, null, $this->count)) {
+ if (isset($m[1]) && empty($this->commentsSeen[$this->count])) {
+ $this->append(array("comment", $m[1]));
+ $this->commentsSeen[$this->count] = true;
+ }
+ $this->count += strlen($m[0]);
+ $gotWhite = true;
+ }
+ return $gotWhite;
+ } else {
+ $this->match("", $m);
+ return strlen($m[0]) > 0;
+ }
+ }
+
+ // match something without consuming it
+ protected function peek($regex, &$out = null, $from=null) {
+ if (is_null($from)) $from = $this->count;
+ $r = '/'.$regex.'/Ais';
+ $result = preg_match($r, $this->buffer, $out, null, $from);
+
+ return $result;
+ }
+
+ // seek to a spot in the buffer or return where we are on no argument
+ protected function seek($where = null) {
+ if ($where === null) return $this->count;
+ else $this->count = $where;
+ return true;
+ }
+
+ /* misc functions */
+
+ public function throwError($msg = "parse error", $count = null) {
+ $count = is_null($count) ? $this->count : $count;
+
+ $line = $this->line +
+ substr_count(substr($this->buffer, 0, $count), "\n");
+
+ if (!empty($this->sourceName)) {
+ $loc = "$this->sourceName on line $line";
+ } else {
+ $loc = "line: $line";
+ }
+
+ // TODO this depends on $this->count
+ if ($this->peek("(.*?)(\n|$)", $m, $count)) {
+ throw new exception("$msg: failed at `$m[1]` $loc");
+ } else {
+ throw new exception("$msg: $loc");
+ }
+ }
+
+ protected function pushBlock($selectors=null, $type=null) {
+ $b = new stdclass;
+ $b->parent = $this->env;
+
+ $b->type = $type;
+ $b->id = self::$nextBlockId++;
+
+ $b->isVararg = false; // TODO: kill me from here
+ $b->tags = $selectors;
+
+ $b->props = array();
+ $b->children = array();
+
+ $this->env = $b;
+ return $b;
+ }
+
+ // push a block that doesn't multiply tags
+ protected function pushSpecialBlock($type) {
+ return $this->pushBlock(null, $type);
+ }
+
+ // append a property to the current block
+ protected function append($prop, $pos = null) {
+ if ($pos !== null) $prop[-1] = $pos;
+ $this->env->props[] = $prop;
+ }
+
+ // pop something off the stack
+ protected function pop() {
+ $old = $this->env;
+ $this->env = $this->env->parent;
+ return $old;
+ }
+
+ // remove comments from $text
+ // todo: make it work for all functions, not just url
+ protected function removeComments($text) {
+ $look = array(
+ 'url(', '//', '/*', '"', "'"
+ );
+
+ $out = '';
+ $min = null;
+ while (true) {
+ // find the next item
+ foreach ($look as $token) {
+ $pos = strpos($text, $token);
+ if ($pos !== false) {
+ if (!isset($min) || $pos < $min[1]) $min = array($token, $pos);
+ }
+ }
+
+ if (is_null($min)) break;
+
+ $count = $min[1];
+ $skip = 0;
+ $newlines = 0;
+ switch ($min[0]) {
+ case 'url(':
+ if (preg_match('/url\(.*?\)/', $text, $m, 0, $count))
+ $count += strlen($m[0]) - strlen($min[0]);
+ break;
+ case '"':
+ case "'":
+ if (preg_match('/'.$min[0].'.*?(?<!\\\\)'.$min[0].'/', $text, $m, 0, $count))
+ $count += strlen($m[0]) - 1;
+ break;
+ case '//':
+ $skip = strpos($text, "\n", $count);
+ if ($skip === false) $skip = strlen($text) - $count;
+ else $skip -= $count;
+ break;
+ case '/*':
+ if (preg_match('/\/\*.*?\*\//s', $text, $m, 0, $count)) {
+ $skip = strlen($m[0]);
+ $newlines = substr_count($m[0], "\n");
+ }
+ break;
+ }
+
+ if ($skip == 0) $count += strlen($min[0]);
+
+ $out .= substr($text, 0, $count).str_repeat("\n", $newlines);
+ $text = substr($text, $count + $skip);
+
+ $min = null;
+ }
+
+ return $out.$text;
+ }
+
+}
+
+class lessc_formatter_classic {
+ public $indentChar = " ";
+
+ public $break = "\n";
+ public $open = " {";
+ public $close = "}";
+ public $selectorSeparator = ", ";
+ public $assignSeparator = ":";
+
+ public $openSingle = " { ";
+ public $closeSingle = " }";
+
+ public $disableSingle = false;
+ public $breakSelectors = false;
+
+ public $compressColors = false;
+
+ public function __construct() {
+ $this->indentLevel = 0;
+ }
+
+ public function indentStr($n = 0) {
+ return str_repeat($this->indentChar, max($this->indentLevel + $n, 0));
+ }
+
+ public function property($name, $value) {
+ return $name . $this->assignSeparator . $value . ";";
+ }
+
+ protected function isEmpty($block) {
+ if (empty($block->lines)) {
+ foreach ($block->children as $child) {
+ if (!$this->isEmpty($child)) return false;
+ }
+
+ return true;
+ }
+ return false;
+ }
+
+ public function block($block) {
+ if ($this->isEmpty($block)) return;
+
+ $inner = $pre = $this->indentStr();
+
+ $isSingle = !$this->disableSingle &&
+ is_null($block->type) && count($block->lines) == 1;
+
+ if (!empty($block->selectors)) {
+ $this->indentLevel++;
+
+ if ($this->breakSelectors) {
+ $selectorSeparator = $this->selectorSeparator . $this->break . $pre;
+ } else {
+ $selectorSeparator = $this->selectorSeparator;
+ }
+
+ echo $pre .
+ implode($selectorSeparator, $block->selectors);
+ if ($isSingle) {
+ echo $this->openSingle;
+ $inner = "";
+ } else {
+ echo $this->open . $this->break;
+ $inner = $this->indentStr();
+ }
+
+ }
+
+ if (!empty($block->lines)) {
+ $glue = $this->break.$inner;
+ echo $inner . implode($glue, $block->lines);
+ if (!$isSingle && !empty($block->children)) {
+ echo $this->break;
+ }
+ }
+
+ foreach ($block->children as $child) {
+ $this->block($child);
+ }
+
+ if (!empty($block->selectors)) {
+ if (!$isSingle && empty($block->children)) echo $this->break;
+
+ if ($isSingle) {
+ echo $this->closeSingle . $this->break;
+ } else {
+ echo $pre . $this->close . $this->break;
+ }
+
+ $this->indentLevel--;
+ }
+ }
+}
+
+class lessc_formatter_compressed extends lessc_formatter_classic {
+ public $disableSingle = true;
+ public $open = "{";
+ public $selectorSeparator = ",";
+ public $assignSeparator = ":";
+ public $break = "";
+ public $compressColors = true;
+
+ public function indentStr($n = 0) {
+ return "";
+ }
+}
+
+class lessc_formatter_lessjs extends lessc_formatter_classic {
+ public $disableSingle = true;
+ public $breakSelectors = true;
+ public $assignSeparator = ": ";
+ public $selectorSeparator = ",";
+}
+
+
dépôts / lhc / web / wiklou.git / commitdiff
